nickbuol,
Just a minor correction. Both my QS8s are to the sides, but the left one is quite close to the rear wall (about 1 foot from it), against which my couch resides. The right QS8 is actually slightly forward of a line parallel to the couch and about 3 feet higher up than the left surround. Despite the different placements, I've never found any objectionable discontinuity in the sense of ambience or surround envelopment. I did play around with placement while listening before I decided on those locations.
I have heard two different sets of QS8s set up at the rear, and I was amazed at how adaptable they are. In both cases they worked really well. I do think it is important to experiment somewhat with QS8 placement and do some listening before you drill holes, because every room is different and has its own unique set of acoustic properties.
Regards,
