Do you still tuck you wet towels into the heating radiator? And have them fall down all the time if you did not do it right?

Here is a simple solution: A sturdy 3D Printed towel bar mount.
This (customizable) mount is designed to hold a 19mm bar with four (4) 4mm screw securley in place, prefereable above your radiator. Distance to the wall is 70mm, enough room for an optimal air flow around your towel.