I am from Germany, but I will definitely keep these in mind if I ever visit the US. Surely there must be similar art exhibits in Europe, but I don't know of any yet.
~25 are more than enough, if they are willing to die. Once a single person gets on the gorillas back while it is distracted and does a proper rear-naked-choke its gg.
Edit: Even if you think this is bs, there is no fucking way a gorilla could take 100. People are vastly overestimating how strong the average gorilla is and underestimating how strong a human pumped full of adrenaline is.