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I understand how to magnetize bases for the rest of my army so it can sit on my magnetic trays for transport, but where do you attach magnets for models like Rhinos that don't have bases?

I have not some so personally, but I’d find the spot where the wheels/tracks touch the ground and sink some magnets there. Probably 4 places, just for a solid grip.

I saw some 3d printed brackets a while back, that you would place snug up against your tank to hold it down.