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@Glws
It is annoying, but in any case, you can't mix road di2 components (shifters, derailleurs) with mtb ones.
I think the reasonning for this array of deraileur mounts is that mtb franes can have radically different geometries. Full sussies, downhill and hardtails come in hundreds of different shapes, chainrings are way smaller than road ones, etc.
Obviously i dont know what stuff you have on the bike at the moment.