My mains are fairly close together as well. I have the side surrounds mounted fairly close to the front wall. This helps give the impression of width. Then I also have a single QS8 mounted in the middle of the back wall, with the volume turned up louder than the system set it as, when I have the furniture arranged so that one loveseat is close to the screen. (The beauty of MCACC's multiple calibration storage capability.)

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing