Excellent! Thanks for the info! Your distinctiveness has been added to our own (sorry that's a little sci-fi joke).
That's a perfect mounting choice for those 6mm magnets (I'm assuming they are the 6mm diameter x 1.5mm thick common Ebay style) as they are high field strength from the front but being thin they give quite a fast field transition then the sensor passes the thin edge (ie slide-by 90' mounting). You could probably detect much better than 0.01mm precision with them.