Two dogs and a food/water dispenser. They keep each other company and keep SLF from doing anything stupid.
You have that already...
A man and a dog. Man is there to feed the dog. Dog is there to bite the man if he tries to touch anything.
This will be the way I fear. A single "minder" forbidden to intervene unless the automatics fail. We're already half way there with the children of the magenta line. It's only a step or two further down the road.
Auto taxi will be the easiest bit to solve.