A nice big E-stop with suitable high-power contacts is also a good option for that.
Nope, how will you know that the 4way power point is having 18A run through it until it starts to smoke? Or the wall outlet starts to smoke? Or the 1.5mm cable starts to smoke?
Too late the damage is done.
Needs to have a current limiting device inline somewhere, that is why most multiboards have an overcurrent trip built in.