I attached a round plate to the outside of the otter (for iPhone 7) and a rectangular plate to the inside of the cloth case (for Pixel 2). Both applications have been working well for a few months. I was concerned that the magnetic pull through the cloth case wouldn't be strong enough, but I had no problems. As with any adhesive application, make sure the surface you are applying to is clean and free of grease (I use rubbing alcohol to clean plastic, metal, or glass surfaces prior to application).
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