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another point on supernova tail lights is that they have no battery/capacitor in it. If you plug them with a supernova in front, then you have a stand light because it uses the battery/capacitor of the front light but that only works with a supernova front light. With any other front light, the supernova tail light will stop as soon as you stop your bike.
Line small from Busch & Müller or its equivalent in Son, the "rear light", does have a capacitor in them for stand light.
Just checking ... are Supernova's tail lights the same for dynamo and ebike?
This ebay listing seems to suggest this fender tail light is compatabile with both
https://www.ebay.co.uk/itm/256013667602
But on the supernova website it does mention "energy supply via e-bike system"
https://supernova-lights.com/en/products/e3-tail-light-2-universal-fender-mount
It's a slick little unit, altough I can't quite get my head around the angle the cable comes out of the unit i.e. directly into the mudguard / wheel