Tool mounts for table top

I have designed a special 3d printer workbench for myself and got tired of tools lying around on the worktop. I have designed a tool mount that goes on the edge of my worktop - which is 9mm wide, the mounting gap is 9.2mm wide.

There are 2 versions with holes for M4 screws and without. I have done a version without to make it easier to resize.

Mount has slidable inserts that can accommodate different tools. I have printed a 30mm tester, 150 mm mount with 2 holes(fits perfectly even without