There are quite a few threads on this subject posted throughout Axioms msg boards..
You will find that the Q's are very very forgiving to placement.. They do not have to be even from one side of the room to the other, height from floor to ceiling, nor distance from front or back wall..
But yes, they would be placed on the sides with a 5.1 system, not the back.. When you go to 6.1, then you would place the 6th channel spkr in the back...


LFE ! The rest is just details..