I loathe being with the majority wink but with 12 feet behind you, the best performing/most cost effective setup is QS8 surrounds with M2 rears. While the QS8s might give you “marginally” better performance, IMO they would not be worth the cost difference.

3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1