Designed to use a 5/8" x 11 3/4" x 2' shelf like this one:
Feel free to use what ever as long as the dimensions are the same (Length optional.) No issues since I used this as a riser for my monitor to get my DAW equipment at eye level. If on a smooth surface I would recommend rubber feet so it doesn't slide.
I used SKB Rack clips for the rack mount holes. Very tight fit, but didn't want to relax the thickness as it is already thin. Once they are in they are IN.
Though I found some 2U desk rack designs, they did not work out for me. I took my first shot at designing a 2U shelf in CAD software. I have not used CAD software before this. Forgive any issues or oversights as it is my first.
Excuse the painters tape as it protects the back of my equipment from getting scratched from the metal clips.