Glad you like them. My only comment would be that your proposed positioning of the QS8's sounds a little odd.
The side surrounds usually go a few feet above ear level, and about 1' in front of the seating position...not behind.
The rear surrounds also do not need to be pointed down at you. I'd mount them flush to the wall with the supplied T-bracket. Again, a few feet above ear level, but this time directly behind you.
Other than that, it sounds like you've got yourself a great setup! (And a great boss!)
