I like the design of Dakanzla's catan-style boardgame 2.0 system. I do not have any stock of the 6x3mm rod magnets called for in their design though.
I do however, have a load of 3x3mm axial rod magnets. I have updated their design for the bases to support two magnets on each side. Press fit the two magnets into each side. Needed 12 per base.
Align the polarity for each of the left hand side magnets on each side to the same and the right hand side magnets to the opposite. This allows for any orientation alignment.