Not a big chance, no. A player has to be like LEGIT up against the fence to get caught and why would anyone get that close to the fence on purpose? Unless they are trying to purposefully get caught. Which is sabotage/team killing.

Now yes, it is easy for a deformed to flip over the vending machine, IF it was only 1 vending machine. like in zm_penumbra_extended, 1 vending machine is easy to flip on a teleport spot. But in this case, 2 vending machines supporting each other, no way not even 4 very skilled deformed can knock both over. Same concept of zm_csk_4corners, that one room where it has 3 vending machines and people lay it across to get the zombies stuck, except that room has 2 entrances and can be broken from the bottom. This certain cade does not have 2 entrances, and cannot be broken from underneath.