QS10's are very forgiving on placement. My family room is a great example ...
(I'll probably repost this to the gallery once we have the room totally together ).
Please forgive it's messy state ... the kids are home and as parents we have sadly failed in getting them to put their muck away (and I was too lazy to clean up for the pictures). We, also sadly, have yet to decide where to hang, no less actually put up, any pictures or art (after a year+ of being in the place) ... all the furniture is temporary till we get out there and replace it ... but hell, it's a family room!
The room is 18' x 18' with M2 fronts, EP500 sub, VP150 center, and QS10 rear surrounds.
Half is dedicated to a ping-pong table. The other half is dedicated to a 5.1 home theater setup and kid computer area. The couch is about 1/2 way between the front and back of room. Putting MLP at 10' from the speakers (12' from the 77" screen). M2s are about 6' apart. Given that ping-pong wallis 13' from MLP and is mostly glass (see third pic) and that the other is about 6' from MLP the imaging is surprisingly good .
The QS10's are about 9" under the 10" high soffit and their bottoms are about 79" off the floor.
As you can see from the 2nd picture they are placed symmetrically on the room resulting in a very asymmetric placement to MLP/Screen. It has worked out fine. Any where on the couch it sounds great. Even when way out side of the sweet spot movies still come off with reasonable surround sound ... this just would not be possible with ATMOS in this room (especially without really mucking up its aesthetics).
front of room showing the asymmetry:
Ping-Pong side ... (with cat in tree)
Note: The final plan is to have MLP about 8' the screen but given couch situation this is the best I can do now. Also there will be a barn door installed as an attempt to isolate it from the rest of the house.