With this thing you can mount 1U rack stuff under your desk. You may have to reverse rack ear direction on the mounted appliance. I used these to mount two 1U PDUs under my desk.

While you could mount things using the rack ears, I had trouble finding screws with wide-enough base to grip the rack ears, but short-enough length that they dont go completely through my desk. This helps with that, by gripping the rack clips and using smaller screw size. I used 15mm long wood screws to mount these under my table.