Tribe told me to man up and take a pack down sad to say I lost my high level rex due to 18 or more in the pack all 75-150 with multiple pack leaders attacking from all sides with another wave ready after they died.Play it smart and check the pack first.
Try to make them fall into a ravine. Flyers help with this tactic. Or better, look for some that spawned or fell into one. There’s a ravine on my SP game where there are around 11 allos that fell into it. After getting them into a ravine, kill off all but the one you’d like to tame. Proceed in taming as usual.