I designed this simple cable holder for a 4.5mm USB cable. The holder should improve the cable routing on a metal plate. I added the original Blender source file so anybody can modify it easily.

It is designed for round magnets with a dimension of 16x5.2mm and a M3 screw hole at the center.
I used these ones: https://www.amazon.de/dp/B0DF7Q68R6