Sounds like it would work great to me. I would definately angle them downward a bit at that height. Mine aren't angled at all and still sound great, but I may consider getting some different brackets some day. Axiom makes their ceiling bracket for the Q's which is adjustable, but not sure how it would work on a side wall.

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