Muji PP Storage Box Table Corners

I placed a board across two Muji PP Storage Box as a small table. But the board keeps moving, not falling down, but it always looked messy.

So i designed small corners that i screwed from below to the board. Now it sits perfectly on the boxes and didn´t move anymore.

The small hole has a 2mm diameter and the bigger hole has a 5mm diameter.
Make sure that you print the corners with the small holes pointing to the heatbed.