Open up the back, there's a small thread that ties up the zipper; just snip it.
There's a perfect recess at his back, I glue the magnet there.
I am using one 3/4 by 1/16 inch neodymium magnet I got from ebay.
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Zip it back up and you can't even tell there's a magnet.
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on the stand I just attach 2 of the magnets, the lip of the stand (from the clamp) prevents it from being pulled down by the weight of the figure.
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The cool thing is because the zipper runs exactly through the middle of the magnet; the magnets do not make a perfect contact with each other that may later cause to rub, fray and damage the cloth in between.
Hope you guys find this useful.