This electrical toothbrush holder has room for up to two charging stations. Additionally a deodorant holder can be added.

Only one hole is required for fastening, so the tool can be easily mounted in the joint between the tiles. To prevent it from rotating after installation, it is advisable to attach a small piece of double-sided adhesive tape to the back.
Support is only necessary with "badhalter.stl". I have achieved good results with "Treestructure" and "Only on plate".