I did a few months for an Amazon subcontractor, during the 2020 lockdown. Loads of people say to put it under the car, in the bin, or on the step. Our boss told us to use our common sense.
We had plastic bags, in case it was raining, but they're too small for a lot of the parcels, so I'd put a couple on the ground, then a couple on to, with a brick, or whatever. People would say leave it in the garage, when they didn't have a garage!
I had one lady complain, because I posted a card and sent a text, telling her I'd be back later. She lived on a terraced street and said to leave it on the doorstep - her door opened onto the pavement and there were loads of people walking by.
Other people were just plain rude, one woman finally came down as I was leaving, after the third knock. She had a phone headset and told me off for knocking, saying, "Some of us are working." I said, "Aye, me too, pet! If you don't want to come to the door, don't waste my time ordering a parcel."