S+ users can do this with 1 sec delay auto doors. First build a stone taming pen. These guys can fit through normal dino gateways. Then take a flier over and piss off the herd. High hp argie is good but these guys run as fast as an one, but mine could take the hits. Lead allos through gate, fly out and then lead the remaining far, far away, or trap them and try to tame all at once (risky imo). Rinse and repeat until you tame all the one you want. Even low level allos are fine if it means you have enough for a gang!
if u are going for an allosaures tame the easiest thing you can do is lead one into a taming pen and then kill the others outside that way they do not have the alpha pack boost affect and you can easily and safely knock it out