Hi Sonos community!

I have a new setup where I have two Play 5’s in stereo pair and a Sonos Arc in the same room (they are facing each other front to front and my room is about - please see image attached ). I have them configured as separate “rooms”. When watching TV, I use only Sonos Arc. When listening to music, I use both setups (Play 5’s in stereo and Arc). 

I have two questions:

1. I’m not sure which Play 5 would be more appropriate to setup as right and left speaker. I don’t want the channels to get mixed with my Play 5’s and Arc.
2. When listing to music… would it be better only to turn on Play 5’s in stereo pair and leave the Arc on mute? If yes, Then question 1 is not relevant anymore.

NOTE: I also have a turntable connected my Play 5’s via line in. If I set them up as surround, I can’t play my turntable anymore. So that is not an option for me.