My setup is very similar. I have side Qs8's mounted on the ceiling between the first and second rows of seating, works great. They are about 6ft to the sides. My rear Qs8's are behind the second row, also on the ceiling, a couple of feet behind and work great as well.

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