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 screws it seems to be very steady), calliper insert and files insert.

Content:
-150 mm mount with 2 holes for M4 screws
-100 mm mount with no holes
-30 mm mount with no holes - I used it to test fitting
-calliper insert(5 mm x 17.5 mm hole for calliper)
-30 mm insert with no holes
-75 mm insert for my diamond files - it has 7mm holes and 15 mm distance between hole centres so I am sure it can accommodate some screwdrivers
-15 mm insert for a double razor holder(https://www.thingivers