Test-fit screws in the interior mounting holes. You may (or may not) find that they only go in a couple millimeters.

There is so much variation among printers, filaments and slicer settings, it’s not always possible to make a perfect mechanical fit for all situations.

If the holes are too shallow, use a drill or Dremel tool to extend them. Poke just through the surface to the infill…don’t drill the whole depth or you’ll punch out the other side.