This is an under-desk mount for the Elgato Stream Deck+. If you detach the base of the Streamdeck, you can use the two screws its attached with to screw it into this mount. Then you'll need two other screws to attach the mount to the under-side of your desk (or wherever you choose to put it).
I've uploaded a photo of the orientation to print it with the least supports.
The author marked this model as their own original creation.