This should support basically every HP ProDesk and EliteDesk mini PC I could find pictures of. It also has mount holes to work mounted forward or backward in the rack. The rack I'm using it with is https://www.printables.com/model/358304-fully-printable-half-width-server-rack-and-trays.
Tested on so far
Let me know if you test/confirm an additional model and I'll add it to the list.
I've been printing them in PETG with great success, supportless when face down per the original design(s).
The author remixed this model.