@Dragonling
1) ATP uses its own class of equipment grid ['locomotive'] so that the module can only be placed into Locomotives, whereas Vehicle Grids uses ['armor'] class for all of them. If I change the class to armor, the modules could be placed in any vehicle. This is not ideal, but it could be an easy solution. I'll try some things and see what works best.
2) Having the module in the menu next to the locomotive is very much intentional.