Mounting:
Insert the top hook first, then lower down while rotating to lock it in place

Print in the following orientation:

Print settings:

You can usually fit 2 of these on a typical printbed. Printing in PLA is advised. 3-4 Walls with a 0.4mm nozzle and 30% rectilinear infill

Make sure these hooks are supported. Use tree supports with the “on buildplate only” setting enabled: