I would mount the speakers on the back wall if you must keep the couch against the wall. They would probably work best but the QS's are very forgiving and will sound great no matter which wall they end up on.

I have my couch about 18" away from the back wall and this allowed me to place the speakers on the sidewall and a little behind. If you can get that couch away from the wall a little then a side wall mount might be viable and allow for a possible 7.1 system in the future.


Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70