Try them both and see which resultant sound you prefer. 

Similarly, if you only keep the phone upright, it will only ever hear the sound off the ceiling. 
I use the technique in the video you posted, which points the microphone in as many directions as possible to get a good sense of the sound bouncing off every wall and item of furniture, as well as the floor and ceiling. That way, it should sound good wherever you sit in the room.

It certainly works for me. But it is all personal taste…

I have, but im asking what the correct technique is they show multiple ways to do it but surely they must of tested it with there tools and discovered 1 way works better than the other. Should I point my phones mic at the floor and at my ceiling should the screen always be facing me. I assume i should wave slowly to minimize the air flow over the mic but why is none of this mentioned is it important. It's literally just watch this video of this roman waving her phone around and then do it yourself, no tips, no suggestions etc.

I do the exact same thing you do and for the sane reason you said, but like I said to the other guy they must have tools to measure and have done a lot of testing of this feature before rolling it out to us. Surely they have some tips, advice, suggestions on how to get the best results they could share with us.  Should we avoid areas were speakers, sub etc are, is it best to do it with doors open or closed does that even matter? The video in the app lacks a lot of information that probably would make the tuning better IMO.

Trueplay isn’t essential, and not always beneficial. I use it for some rooms but not all. At the end of the day, the “right” sound is what you like, regardless of how you created it. 

I know its not essential and not always beneficial and im not asking what the right sound is im asking what the right technique is to put it another way, how do the people who created and developed Trueplay do it. I found this page that has some tips on how to do it but why isnt this information available in the app along with the tuning video https://support.sonos.com/en-gb/article/tune-your-sonos-speakers-with-trueplay notice how it says to use smooth movements and go from head to waist, thats good information to have before beginning the process IMO but its also not enough info, it doesnt say anything about were to point the phone while tuning, if this is designed to measure how sound reflects then surely it matters were the mic is pointing. Also notice how the guy in the offiicial Sonos YouTube video clearly goes past his waist.

The app will show you a video on how to make smooth movements with your device from head to waist as you move around during tuning. If you are tuning a speaker in a small room, use any remaining time after covering the room to focus on the areas where you listen to Sonos the most.

I really don’t think there’s a truly critical technique. And, if different techniques result in different sound profiles, you still should be deciding which sounds best to you regardless of which technique you used. 

But since you’re clearly obsessed by discovering “the right technique” - which only a Sonos representative can tell you - I’ll bow out and would expect other contributors to do so too. 

thats the problem right there, technique results in different sound profiles and is exactly why im asking this question its also why its posted as a question and not a discussion, do you really think when Sonos is developing, fixing and fine tuning Trueplay they just randomly wave the mic about differently every time? No they dont they must have notes, research, tools, some sort of standard order of procedure on what works best. Probabably have some sort of graph/map that let's them phsically see the results of different techniques. There's no way they just mooch around a room waving a mic and then use there ears like we customers have to. Im not obsessed but if Sonos have the balls to tell customers/installers they need an IOS device to tune speakers then clearly they think that the embarrassment is worth the results it makes so why not tell us how they do it.

If technique doesnt matter then why go to the trouble of making a demo video and including it in the app, assuming its baked into the app it seems like an unnecessary hit to the apps installation size and a waste of money assuming it wasn't made for free.

Peter Pee is your man for this sort of thing. Watch his video and hopefully it will help bring this to a conclusion.

https://youtu.be/_AeSKXbchDA?si=dOAHqKokC0GU0D4b

Cheers but ive seen a lot of his videos including that 1, but this is the point im trying to put across, everyone seems to have different techniques all of which result in different sound profiles. Sonos put time, effort and money into developing this tech. I have seen people saying it makes no or very little difference and thats probably because there not doing it right and the reason for that is the lack of information on how to do it. Theres only so much you can get from watching a woman wave a phone about in a video.

And what about after tuning all it says is to turn phone around and tap done, at Sonos they probably have tools and software to see visually how the sound has just changed. I get not sharing that with us but i think if they shared how they themselves tune along with some feedback and tips like you went a bit fast go slower next time, walk around more to cover more of the room or more of the listening area, dont point the mic at your sonos speakers or at the floor, to much air passed over the mic, just any sort of help would be nice. I mean the video could have a simple voice over pointing out details in the technique used. It's a really lazy video tbh. Peters tuning video is more professional and what I would expect from Sonos themselves.

If what Peter is doing is the best way to do it then that video should be included in the app instead.

I’ll leave it with you. I can add no more.

None of us can, other than (possibly) a Sonos rep. 

Which is what im looking for i know theres reps here, anyways its clear Rhonny understood the question straight away when he said if you only point the mic at the ceiling then its only ever going to hear the sound off the ceiling. Now if thats confirmed by Sonos to be true then that means the official video in the Sonos app is showing customers the wrong way to tune. Unfortunately the only place to see the video is in the app at the 2nd stage of the tuning process. If there improving the app then they should probably fix that video along with it.

Really a customers YouTube video is marked as the best answer to my question :/ 

This may answer some of your questions:

https://tech-blog.sonos.com/posts/trueplay-spectral-correction/

Ensure your phone mic is clean from pocket fluff & dust. I only wave the phone where ears are in the room, I dont see any reason to wave a phone on floor, unless you lay down to listen to music, or wave high towards ceiling, unless you listen up a ladder.

This is taken word for word from that link Once you tap start, the test tone begins to play. You walk around, waving the phone as shown in the video. She has the screen facing her and the mic pointed up at the ceiling.

Ignore that then. Maybe someone from Sonos will see this and change things, but in lieu of that just take the advice given by real-world users. And go for a walk or meet up with friends. 

Its like no one is interested in knowing how Sonos themselves do this, they would rather spend a fortune on speakers and just wing it or copy some random YouTube video and no thats not a shot at Peter, im just saying he is a customer and its a random video on YouTube of his own method of tuning its 100% unofficial.

The 1st step balancing the sound is perfectly explained its difficult to go wrong with that, the 2nd step is unclear and as room correction is cited as 1 of the most important things to do, it would be nice to know how to do it.

Anyways this is a question not a discussion so let's leave it at that.

All you need to do is slowly walk around, waving it slowly microphone-forward up and down from head height to waist height in a circle around the room ensuring you cover all areas where you will most often be listening. That is it. Trueplay will do the rest. If you don’t quite like the result, just do it again. Don’t walk too fast, and if you can time it so the circle closes when you’re back at your starting position you can be sure your app has picked up all the readings it could possibly need. 

This is precisely what I did and the Sonos sounds stellar.

 
I too will leave it at that :)

As I posted some while ago, unless someone from Sonos will say what the “correct” method is, we’re only guessing - if there even is a correct method. 
 

That said, the most telling comment in the article ​@craigski linked us to is at the end:

“Maybe a slightly different path around the room, or a little more time spent in the areas where you prefer to listen, will give a better result.”

This just reinforces my belief: whether you hold the phone one way or the other, with mic pointing up or down, facing you or away from you, will probably give a different tuning result. So too does the route you take dancing around the room. So does how high or low you sweep your phone, how big the room is for you to cover all of it - or maybe spending more time close to your listening position.

Perform a Trueplay dance, listen to the resulting sound profile, and if you like it, keep it. If not, Trueplay again.