I received a knock on my door and asked who it was. No answer, I asked several times but no answer. I peeped out the peephole and didn't see anyone. I finally open the door and I saw an Amazon package at my door. My question is Why couldn't you stand in front of my door so I could see you? Why didn't you answer me through the door? That spooked me out because that means you were standing on the side and not in the middle. Very strange. I started to report this to Amazon but never did.
I assume the "package" could not answer you. The delivery drivers do not have time to wait on you to finish what you are doing and come to the door. They do not have to knock at all.
It isn't their fault you are "spooked" easily. There is nothing strange about standing over to the side of the door. There are no rules for where the delivery people have to stand if they do require a face to face meeting.
I did have a FedEx guy that was a driver helper and he knocked hard on the door. That scared me because I did not know they were there but when I saw the truck it was fine. He dropped packages, knocked, and ran. They have a lot of packages to deliver. I do not expect them to stand there until I come to the door. And they are not required to.
If I was really concerned I would invest in cameras (you can purchase them at Lowe's) and put them so that I could see all of my doors. But if they are wifi cameras they can be hacked in to. And sometimes interference can cause you to be able to see somebody else's camera. Kind of like with a CB type radios and sometimes the local fast food drive thru orders will run in on them.