Bill, aside from the ceiling mount question, the #1 arrangement is closest to the ideal. The side surrounds in a 7.1 setup should be directly to the side of the listening position. The back surrounds should be separated enough to give listeners both a left back and right back effect. They certainly should be farther back than you propose, however, as Bruno points out, for a rear sound field to form, even on the back wall if necessary.
The use of the QS8s for at least the side surrounds is strongly suggested, with the right one on the wall about 6-7' up and the left one suspended from the ceiling.
