As I could not find a simple and suitable wall mount that did not take forever to print for my Lighthouse (Index) I designed my own.
Held in place on the wall with 2 flathead screws (max 4.5mm for screw diameter and 9mm for the screw head diameter).
After it is mounted to the wall the lighthouse is slid in from above in its standard mount, see picture.
Printed flat with no supports, 0.2mm layer height. Might work better in 0.15, not tested.
The author marked this model as their own original creation.