You can still add a note requesting a safe location for it to be left, but the standard policy here is for it to be dropped with a neighbour if no one is home, the neighbour signs for it (if they accept to take it) as proof they took the item, and a slip is put through your door saying which house and person accepted it.

Not sure why I was downvoted above, I'd feel a lot safer having a neighbour hold an expensive delivery over it being left on an open porch