The QS speakers are very forgiving. I had a similar setup years ago, and had my QS8s mounting about 5 inches from the ceiling. That worked well. Of course, now I have them about a foot or two above ear height when seated. That works great too.
I agree totally with that .. because of a few obstacles on the walls I have the qs8's 6 inches from the ceiling and works great.. you can position the qs speakers almost at any height as long as they are all at the same height and you have them correctly configured in your AVR
