I'm going to have a 5.1 setup with wharfedale diamond 9.1's at the front & I'm trying to decide the rear surrounds. a) one option is 9.0 on wall brackets angled in & down to listening position or b) using 9SR which are mounted flush on the wall pointing outwards & wouldn't point in & down. Which will give the best results? My sofa is pushed up against the back wall. Appreciate all input.