This is a OptiPlex Micro (MFF) wall mount. Single and double mounts included. There is a slot to run a 1/2inch strip of Velcro around the Mini PC's to minimize sag and a screw hole to firmly attach them firmly to the bottom shelf.

This remix also includes slots to run 1/2inch wide Velcro strips through and hang the Power bricks underneath.

For the Single mount, you can either use bellingeri's single top hold down or mirror the bottom shelf like I did.

For the Double mount I'd suggest using the included double hold down.

Use truss head screws or washers to attach to wall.

Should work for most (all?) OptiPlex Micros, but tested with a 3020 and a pair of 5050's

Original model: https://www.printables.com/model/372832-dell-optiplex-mff-micro-support