I'm not sure what your point is. They have to all sit on the top until the last person gets up. Then all climb down the other side. Good luck not getting spotted by a drone or motion sensor, or camera in that time.

A family with kids couldn't get over that wall. Someone transporting a cadre of sex slave prostitutes will have a hell of a time getting over that wall. Anyone traveling alone/discreetly (like a heroin smuggler) can't get over that wall.

Works for me.