“It depends”
Probably the simplest answer is that the fact that they’re inside one actor makes no difference.
If they’re all using the same mesh and materials they might get automatically batched into a single draw call, but there may be circumstances where they won’t. If they’re HISM/ISM components as opposed to regular static mesh components then they’ll obviously be instanced. If they’re all regular static mesh components using different meshes then they will each be individual draw calls.