im seeting up a 5.1 system in my room. and i have tower fronts and centre and sub......

for the rears i have two somewhat small book shelves. the only problem is that its not a typical 5.1 set up most people have a couch in the middle of the speakers. i have a bed slid right up againts the rear wall.......

so i was wondering if it would be better to place them on the wall higher like at the ceiling and aim them downward. i just dont know how that would sound.

my bed is about 3 and a half feet tall at the back so what height would be the best to mount them. the usual set up says 6 feet but im thinking it would be lower for this. but i like the idea of tilting them down over top

any ideas?