sonos play 1 & ray

So if I watch the YouTube Music app then the sonos will play in stereo on all the speakers?

If you send the signal from the YouTube music app via AirPlay 2 to the Sonos speakers, and you have set the surrounds as ‘Full’, rather than ‘Ambient’, yes. 

And through Android TV with an optical cable?

Many questions 😊

Doesn’t matter. If the input is via the digital port (in your case, the optical connection from a TV), then the settings for ‘full’ and ‘ambient’ will be ignored for any data coming in on that input. If you’re streaming music via an analog port (which you don’t have) or streaming from your LAN (which you do have), that setting will be enforced. 

You need to think of it as where the data is coming into the Sonos system. If it’s via the digital input in the soundbar (be it a Ray, a Beam, or an Arc), then that setting is ignored, and the surround speakers play the surround information, if any, only.  If that data is coming in from another input (an analog input, or via an internet stream), that setting is used for the surround speakers, and Sonos uses those speakers as ‘full stereo’ in the ‘full’ setting. 

So, if you’re watching something on the TV, they always work as surrounds, and play that data stream. When you’re streaming information not from the TV, they can be set to be normal stereo speakers. 

Your other option is to get an Amp, which has an HDMI input, and passive speakers, and that will give you stereo sound from the tv but with the option for a much wider soundstage than a soundbar can manage by placing the speakers more widely. 
You’ll still have the delay if you group the play:1’s but probably with just the Amp you’ll have a more satisfactory stereo listening experience for tv-sourced music. 

thank for your help