For what it’s worth, I would say that an RTS with lots of units is not good for Unreal Engine in general. Unreal does not give you deterministic simulation, which pretty much all RTS-es end up needing to support the unit counts that players expect. You can bolt on a separate deterministic simulation engine on the side, but then you’ll have to do a lot of work to integrate it with the editor, blueprints, savegame, etc.