I needed a mount that could be attached to underside of the lack enclosure, but also allow me to remove it as needed.
I've designed the mount to allow aircirculation on both sides of the case.
You will need to select your case top from Malolo's screw-less case design. https://www.printables.com/model/4074-malolos-screw-less-snap-fit-raspberry-pi-4-model-b
Recommend printing in PETG and supports for the mount as there are overhangs.
The author remixed this model.
I have modified the base to allow it to be easily slid onto a custom mounting bracket.