Putty helps anyway with getting the magnet as close to the surface it's supposed to attach to as possible anyway, and I've found that a bit of a greenstuff lip around the magnet also helps with sliding.
Take a ball of putty, superglue to the bottom of the base, put the magnet onto the putty with a small dab of superglue, and press against a moistened flat surface to get the magnet flush.
Or skip the superglue and then glue the putty and magnet back to the base after they fall off in about a week.
It's my go-to storage method for just about everything, in plastic tubs with steel sheet metal.
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