I am in the process of finishing my basement and upgrading my surround sound system. I currently have a Yamaha HTR-5560 6.1 receiver with JBL sub, JBL center channel and 5 little JBL satelite speakers along with some old Infinity bookshelf speakers. I have decided to purchase the QS8's for rear surround but do not know where to place them. Can these be mounted to the ceiling? Is there a big different in sound compared to wall mount? The ceiling in my basement is only about 7'6" high.