Build 5 stone dinosaurs gateways in a circle with 2 pillars in the middle of each doorway except 1, lead the desired tame through the gates with 1 pillar and as he's stuck, put one on top of the first pillar trapping him.
If you encounter more than one, just lead them all to the trap. Knock out lower levels first. Then knock the one you want. They knock fast and have a really low torpor loss so even if they get low you can knock all 3 before they wake up. Only bad side is if all 3 are biting the same area attacking the trap.
Think about this: The taming in ark is crazy. The last thing the Dino would remember would be you impaling it in the face with toxic arrows before it gets knocked unconscious. And then somehow it eats while knocked out which makes no sense and then wakes up and loves you till it dies.
Yesterday(Oct 21 2020) I tamed to of these beauties! One was lvl 209 and a female wen I tamed it and the other was a male lvl 80! I also bread them,I used a pheromone the baby is fine tho, the tip here is how I tamed them. Ur gonna need a tapejara and tranqs.OK,
1.go to the red woods on ur tapejara
3.land on a tree with ur tapejara
4.WACK TRANQ DARTS ON ALLO HEAD!
5.wen its out, check the area
8.........that's all..........hop u like ur allo......
My name is Ashham and I hop u like it goodbye and..........
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