The best tactic to tame them I find is to use 4 stone Dino gates and gateways, kill the car is from afar, then lead him into the pen, have a bear trap ready to stop him from biting you as you close the gates. Then us tranq arrows. Warning: do not forget to put the gates in the gateways, they can fit through the gateways
It really is that simple though, they can't reach you or your flier on a big enough rock, so if you don't want to make a trap you can just shoot down from a rock or cliff once the carnos are dealt with. Be ready for a goose chase once it starts running.