Magnetic mount for 4-gang mains block

My printer stands on a wheeled tool cabinet, which is steel. I was using sticky pads to fix things to the sides, but this wasn't very successful. So, I am creating magnetic mounts which will fix the cabling etc to the cabinet.

This is the first one, which will mount a UK mains block (perhaps others too) to the side. It has cutouts in the base to accommodate two 30x10x5 mm magnets and four strips of 20mm adhesive foam (to add friction to stop it slipping)

It then has two lugs on the front t