Harbor freight version was too small for the brand I have so I recreated for a 125x60mm box. Printed flat and added just a small support for the push peg. Print file includes plate with two brackets and two multiboard snaps. STL is one bracket. The snaps can be found separately at https://thangs.com/designer/Keep%20Making/3d-model/Multiboard%20Snap-974295 from Keep Making.
If you use the file(s), please like, rate the design and leave a comment (you can get points for doing so). If I know people like my designs I will continue to share them publicly.