I live in Philadelphia behind a door with an entry code, and the only carrier that actually listens to the signature requirement is the USPS. My carrier rang my Nest doorbell to tell me he signed for me. (this was actually ideal, my mail carrier is amazing)

UPS and USPS are pretty good about using the door code, FedEx is spotty at best. Lasership, DHL, etc., will drop the package at your door without even ringing the doorbell, and where I live, there's about a 15 minute window, if you're lucky, before someone else grabs the package.