Anyone use magnets to store or stash guns in convenient places?

I have had two of these for a while and like them a lot:

They mount anywhere...under a table, the underside of a nightstand drawer, above doorways etc...

I recently (as in 10 min's ago) ordered 10 of these to attempt to make my own.

I figure a can or rubberized spray paint will be enough to protect the gun.
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