It is now supported!   Make sure to update the app.  

Hi @Bibs0n et al

I am happy to confirm that TruePlay Tuning now supports the use of inverted Era 300s in a Home Theatre setup.

I hope this helps.

Hey there. Thanks for the update. 
 

it does not work for me. I just turned my rears upside down and did trueplay again. Channels still not inverting. Am I missing something?

sonos app version 80.11.51

Speaker version 16.4.4

“Channels still not inverting”? Not sure what you mean by this. 

My initial “complaint” was that the era 300 can be mounted two ways but side speakers are not inverted/switched by software. Two ways: Controls facing up or 180 inverting the whole speaker so controls are facing down. 
with this the two outer speakers change direction which is a problem with 7.x.x audio feed. 
When the era is in regular orientation (controls facing up), the surround back channel is played from the inward facing (to the main listening position) speakers while the outer speaker (away from the center of the two eras) is playing the surround channel. When you the turn the eras upside down the inner and outer speaker has to switch as well. Otherwise (and that is the case) the surround back channel plays on the surround channel und vice versa. 
 

Do you know what I mean?

Got it, thanks. Obvious, once you know

Hi @gentrylord 

I’m sorry to hear that things are still not working for you - I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.

I hope this helps.