Before you drill any holes, I'd suggest you temporarily run speaker wire around the room perimeter to experiment with different QS8 positions. Theory is one thing, but real listening tests sometimes differ.
I'd already drilled holes and fished cables into the wall, only to find more extensive listening tests indicated different QS8 locations were more optimal.
Try both HT and music, ideally multichannel music. You can temporarily set the QS8 on some boxes, shelf, etc. When doing this, it may be best to rotate it 90 degrees, so the bottom woofer isn't blocked. But be careful it doesn't fall off -- it's barely stable this way.
Once you've found QS8 locations that work best, then you can drill holes and run speaker wire. Just a suggestion.
