Direct radiating speakers (bookshelfs) don't envelope/surround you in the experience like a true surround speaker. You have to be in more of the sweet spot. Now, being that far back it might work out fine. Some who listen to 7.1 music find it nice to have bookshelfs in the back. I think the Q's do a great job for HT and music.

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