I bought a rack shelf @ GC. I used a longer screw to attach a Brick & a Ditto to the rack shelf using the same screw holes that are used for the units' rubber feet. Keeping the rubber feet on allows room to breathe & cool & adds a little bit of a shock mount, but the feets make the racked unit a little taller. With both units installed, with the rubber feet left on, Its a little taller than 2u, but, I think that this is a good thing! This forces me to leave a little space in my rack for cooling. The shelf has an open top, back & front. ...plenty 0 room to cool here. Right now I have The Brick & a Ditto on the shelf....Im sure I would have room for at least one more Brick or maby two & still allow plenty of room for heat dissapation. The rack shelf cost me about $20.00... Low Tech & Affordable!!!