Command strip mount that fits the mounting hole on the back of the model.  Mount is 14mm and should be glued in.  Designed to be center mounted with minimal visibility.  Recommended to print in color matching to skull or wall color.

Designed in tinkercad.

Print details:

0.3 layer

3 / 3 / 3 perimeters

10% infill

Print in the material of your choice.