A lot of us use Q's all the way around and it is awesome. The main goal is that you have enough room behind the seating area to justify "rear" surrounds, sounds like you do. For 7.1, the "side" surrounds should be directly to the side of the seating area.

The design of the Axiom 4 driver speakers envelopes you completely.

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85