I played wL zombie server for 1 and half year i'v done it prob 3-4 times and they were no such no rule as no hiding in props. Now as u can see in that video it looks as if zombies cant knife him from the outside of the vending machine, there are many ways to knock it over - standing on top of it and pressing E should knock it over or u can knock it over from the other side of the wall and by pressing E. Clearly you don't play on the server enough to know all this sheeeez.