Metabox Cleat Set
thingiverse
If you use the Metabo tool system, you probably have some of their metaBOX systainers by plaston. Here is a cleat set to allow you to connect a board to the top of your boxes. Just print, place in the appropriate positions on top of a metaBOX, and use CA or double sided tape to position them on the board - and then screw in place. I used this to connect a Metabo vacuum onto my metaBOXes, but you can use it for any other purpose you can dream of. Simple to print - I don't think the settings really matter. You may decide to beef it up if it needs to support something sturdy.
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