As fate would have it, Fjallbo shelves and Skadis boards are the same width. So why not mount the skadis to the fjallbo?

I made these hooks to screw into the wood top of the shelf. I also made some magnet sleeves for 6x3 magnets which I superglued to the back of the skadis on the bottom.

Printed in PETG, on the side. Printing flat might be better for the screw hole integrity though, I'm not sure. Let's see how it holds up!