I didnt find anything similar, so I designed it myself.
I printed in PLA with 15% infill. There is a single and a double sided version. The single sided version does not need supports, the double sided does.
The holes should fit M3 screws, if you want to secure it even more
https://cad.onshape.com/documents/a1e7b7c969068b90f4d7d0d4/w/c1545c871a6b03d6970445ba/e/a3e7e782ce832a7244f98c8a
The author marked this model as their own original creation.