I used to live in an apartment with a patio which had a 6 1/4 foot wooden fence...which also happened to be the only way in/out. The FedEx guys never knocked, and almost always threw the packages over the fence as indicated by placement and condition (and I saw them once). The UPS guy would bring it right up to the door, knock, and either hide it under the swing or if the package was small enough, stick it between the screen door and the regular door.
Working at UPS has certainly changed my opinion of the company, and not necessarily for the better, but I still prefer UPS over FedEx as a customer.