I am in a quandry as to where to place my QS8's...

Since my listening couch sits on the back wall I have no way to get the speakers any distance behind me. I can get them 1-3 feet above my ears and 3 feet to the side, but I am sitting on the same 16wx20h ft. wall as the speakers.

On the other hand, I could place them up on the side walls, but again I will not be able to get them behind me at all. In this position, they also will be located in the corners where the side walls meet the back wall.

So the question is: Back wall unobstructed, or side walls obstructed on one side each?