A simple hook I modeled to snap onto a wire shelf unit. The top snaps onto the upper wire, the bottom attaches to the lower wire to prevent it from pulling off when removing items from the hook.

*Removed the 15% infill in favor of the 100% infill version. MakerWorld will not allow me to have both (they delete one) so I preferred to keep the better of the two options.*

If you need something to mount a MultiBoard to a wire shelf, check out platini76's  hook here:
[https://makerworld.com/en/models/1165116-wire-shelf-hooks-adapter-for-multiboard#profileId-1172299](https://makerworld.com/en/models/1165116-wire-shelf-hooks-adapter-for-multiboard#profileId-1172299)