They won't be mounted directly to the wall, just to clarify.
They'll be on Target (the UK company) brackets which bolt to the wall and then you set your speakers on them. I have them installed now with Matrix 805's and the backs of the speakers are probably 5"-6" away from the rear wall.
I definitely think that the 805's are too large to be mounted that close to a wall, but the one with the good tweeter sounds good located that way.