I really like the Gridfinity modular box system. I made remix from this https://www.printables.com/cs/model/360046-gridfinity-modular-baseplates
Here is the Gridfinity with a magnetic baseplate for the IKEA Skadis tray.
Print 2x and use M3 screws with hex nuts.
The author remixed this model.
Small update to fit an IKEA Skadis tray.