I found when trying my Bheringer ms20's on the wall with brackets, they stuck out a hell of a lot, and that was just with the depth of the speakers, with the Edifier R1900 TII, don't they have fins on the back ? Personally I have mine on each corner of the desk, pointing in at an angle, so the sound is directed to each side perfectly. That's the worst thing about active studio monitors,is the depth with the cables, fins, and generally deeper than the norm, they tend to stick out more than regular desktop speakers.