You don't need make gate or complicated trap for high level. Just make 2-3 large bear trap and put it straight like OOO like this and make sure the trap is between you rex like this (rex)the trap(you). Low level only need 11+ tranq arrow and 3+ scorpion kibble and do not need any narcotic if you use kibble but you can bring it for unexpected thing or not enough kibble. This trap also work on low level spino or other dino. But alway remeber that it only work on low level dino and you can make 4 large bear trap.
To tame one make a trap out of wood gates, stone if a higher level, that looks like this (from above) /_\ afterwards, put a large bear trap in the middle. Then, using one last gate, fill in the gap on the top. (Obviously you can rotate the trap making the gap on the bottom or top.) Afterwards just knock it out! Good luck taming! 🦖
If you use the bear trap strategy which is if you lead it into a Dino gateway that is shaped in a triangle and with a bear trap in the middle (Large Beartrap) and when it is stuck you must put a dinogate behind it to trap it and then knock out.