That’s not how NIP05 IDs work. Yes, there will be impersonators. But their npubs won’t match the original npub’s NIP05 (e.g. only Carla has her npub tied to carla@nostrplebs.com)
Discussion
Without prior knowledge it's impossible to know which nip05 is the right one though, I can create a carla@nostrverified or even my own domain