A set of refrigerator frame magnets. Two frames with hangers and one square one without. There are two shallow insets on the backs to accomodate a 10 MM magnet. You may need to find good magnets that will be able to hold more weight if you are using the hooks. I am using rare earth neodydium magnets that allow a smaller light weight item to be hung.

Using minimal supports to support the hooks, and the top inset lip on the square frame. Can be resized.