Magnetic Camera Mounting Options?

For temporary camera mounting, who makes magnetic mounts? I see that Panavise has a box camera 1/4-20 option:

Magdaddy also has a magnetic kit that looks like it might work for other form factor, but the documentation isn't clear:

Does anyone have experience with these or have other options? Especially curious how well they hold cameras of varying weights, not just relatively light box models.

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