Attach to your board with four single Multipoints or two Multipoint rails.
NOTE: Photos are from an earlier prototype but OrcaSlicer kept crashing when I tried to export. The STL I finally managed to save has slightly shorter Multipoint rails but still mounts the same way and should be more than sufficient unless you're filling it with lead or tungsten.
Suggested print settings:
The author remixed this model.
Removed magnet cavities, added Multipoint rail cutouts.