I have read the previous posts about using 2 Sonos Moves as rear speakers. Frankly that because they are portable, Sonos does not allow this, is ridiculous. Similarly to the inability to have a stereo pair in bluetooth which is also ridiculous.
Sonos, as a cutting edge tech company with great products, your software is letting you down. Get these matters sorted. Much much cheaper UE speakers can do this. Why can’t you??