This is really just a one off original design, I have a metal wire grid that has curved wire ends, so I made custom wall mounts. They make it stand our since I printed 3 in white and 1 in red.
PLA or PETG is better.
On the bottom mounted ones I ignored my screw holes and drilled out a center hole instead that works great, so you could do the same. Just remember to add the hole inside the cone of the top part.
TIP: I did add a touch of super glue to lock on the top plates since they are mounted on something that gets pulled on multiple times a day as we hang hand towels to dry your hands next to a sink.
The author hasn't provided the model origin yet.