This is a remix of a 1U rack mount solution for Dell Micro computers that keeps both computers the same orientation.  It should work for all variations of the Dell Micro computer (if in doubt, the computer measurements are 182mm on the front, 178mm depth, and 36mm tall).

You will need to print one right, one left, and two rears.  There are two rear options: one with loops for zipties and one without.  This model also pairs with the Mac Mini rackmount tray option.

Each rear is attached with 2 M4x12mm socket cap screws.  The left and right sections are attached with M4 socket cap screws and nuts.  The model is designed for 65mm screws, but you might need to cut the screws down if your print of the model shrinks slightly.

I recommend you print in PETG, ASA, or ABS for best durability, but PLA will likely work if you keep it supported on top of something else in the rack.  I recommend printing with 0.2mm layer height with the front face on the bed.  I printed in PETG on a Bambu P1S without brims.