Hi all, I'd really appreciate some advice on the positioning of my rear speakers (MA Silver fxi - along with 8is at front and 10i) as they're going up high on the wall - so not much scope to experiment before I start drilling the wall! I've (hopefully!) attached a drawing of my room - should the fxi's go at each end of the wall facing the fireplace, or on the centre of adjacent walls (behind each sofa)? Please help! Thanks, Adele.