It seems that the "A" position would be best in the diagram above.

If I can hi-jack for a moment. What if he were to be running a 7.1 set-up, with the "B" speakers equalling the rear surrounds. Where would the "A" speakers best be placed? Any ideas?

I too have a room where the listening area opens up and I cant decide between ceiling mount, stand mount or back wall mount for the QS8 located closest to the bottom (in the diagram).