Just got my Axiom QS4s. While trying to line up the bracket with a stud I discover it is not possible to place them where I was going to. Around 3' up on the wall directly behind my couch. They would have been right at each end of the couch. My next option is putting them around 4' up and 2' out from the listening area. Still on the wall directly behind the couch. Would this be a bad placement?? BTW side wall placement is not an option.