Braden, yes, as was said, the back corners are the suggested mounting area for the back surrounds. If the door is about 78" high and the ceiling 96", the QS8s could be mounted with the bottoms at about 79", allowing room for the top mid-woofer. The height would be good and not significantly different from the side surrounds, and the 9' separation is suitable for the distance behind the seating area.

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Enjoy the music, not the equipment.