These are hooks compatible with multiboard.

The problem with most multiboard hooks is that they are pressure fit. The work great as long as you don't pull them. When you store cables and tapes, you tend to pull on the end of the hook, resulting in dismounted hook. Thus this design.

These hooks can be very strong. They are printed horizontally maximizing their strength but they have some flex at the default fill of 15% (the higher the fill the less flex).

The real weak point becomes the multiboard. The hook will probably tolerate several kilograms, but the multiboard will start to flex due to the load. It will also depend on where the multiboard is screwed to its surface. Print one and test for your application.

Because there is no standard orientation of multiboard, you need to test which version (A or B, labels embossed) fits your setup.

Instructions

Make sure to print the hooks and anchors flat on the bed.

1. Print the small hooks
2. Determine the orientation of your multiboard. Screw both into your multiboard, and try to see which one goes farther while staying properly oriented. That is the orientation of your board. It is ok if it is not totally in (1/4 rotation is ok, make sure it goes all the way in). that is what the anchor is for.
3. Print the hooks of the orientation you want
4. Print the anchor(s)
5. Slide the hook into the anchor (if you use PLA, it might take a bit of pressure, but once it is in, you can loose it by moving it back and forth few times). 
6. Screw the hook into place
7. Attach the anchor to the multiboard using the 12mm version of these bolts to secure it in place: https://makerworld.com/en/models/862001#profileId-812470

Other hooks

If you need smaller/slimmer hooks, check these model: https://makerworld.com/en/models/913165#profileId-874305