Hi MN, welcome to the forums, you'll find the SQ8's(Quadpolar) are very forgiving compared to placing most other types of surrounds. The preferred location is to the side of the listening area and 1 to 5 ft above ear level(when seated). Although....and I will quote my QS8 instructions here..."if your room doesn't permit side-wall placement of the surrounds, the QS models will work very effectively on the rear wall behind the listening area".
10 to 11 ft is fine for the M60s, just might want to toe them in a little towards the 'sweet spot'.
