You are not alone with this fantasy. There is various amateur porn (in the older days handyman/plumber/electrician, nowadays food delivery guy) that caters to this taste.

I never ordered food delivery, so the first question is, how do you know who will show up? Does their schedule allow breaks? I'm not a "fuck and go", or in your case "suck and go" person, a quicky doesn't do it for me.

Handing over the goods and the money (or already paid online?) in a public space and not at your door is indeed a disadvantage. This is general, several of my friends in Bangkok live in fancy apartments that cost a lot of money to rent, but access to elevator is only with key card, so they have to go down to receive guests. Whereas my last room in Bangkok was accessible for outsiders, I could tell boys the room number and wait for knock on my door.

There must be a way around that, like sending a one-time code to the delivery guy or guest so they can use the elevator, or open locked doors, to come to your room. Business idea?