I have the Thule Velospace XT 2-bike carrier.
Thule VeloSpace XT 2bike 13pin UK Model (938)
I have had two emtbs on there, with little difficulty. We just needed a bit of head scratching to make sure that our saddles went under each other's bars and that the pedals didn't get in the way. It was easy once we'd done it once.
One bike was a Large Focus Jam2 and the other was a medium Merida e160.
The rack is designed for fatbikes and/or emtbs. The bikes can weigh up to 30kg each and the tyre width up to 5" (I think, if that is important to you, best check). Anyway, it's certainly more than you need for an emtb.
Because it is stronger to carry more weight, at 18kg it is 4kg heavier than the normal 2-bike carrier. The one I pointed to is a 13-pin version, so any electrical gubbins on your car will be supported, provided it is installed correctly. It will need a 13-pin towbar or an adaptor plug if your towbar is 7-pin.