The latches are symmetrical, so there are no alternatives for now! Print on!
The holes for the magnets are precise, so you will need to apply some force for the magnets to fit. The easiest way to press the magnets into place is to use a metal tool with a flat surface.
Place the magnet on the flat surface of the tool to begin
Position the magnet over the hole
Press firmly down on the top of the tool
The magnet should now be flush with the latch! Make sure you add the magnets so that they attract each other depending on the piece you are working on!