Strength analysis shows that the hook can be loaded with up to 88 lbs (40 Kg)
It should be an ABS plastic used, which has a yield strength of at least 38 MPa
The "Wall Hook Monster" Variant was not subjected to any detailed strength analysis.
The model had to be greatly simplified for the FEM analysis.
With a safety factor of 1.6, a maximum load of 30.6 Kg (Force = 300N) can be used. (see attached pic)