Before my game got overrode I had two of these guys. They were absolute beasts, I would run around with them and farm supplies from dinosaurs. The best way to tame them is to him them once get on a flying mount get on high ground, and then pump them full of tranquilizers. They make great mounts too.
To knock them out find one put all your stuff in a storage bin get a bow/cross bow and tranq arrows to knock it out run and hit it with your bow/cross bow. To tame it just get any kind of meat you like and shove down its throat
If you want to tame a carno prefer using a crossbow and tanq arrows if your gonna take a high lvl one then your gonna need like 10-15 tanq arrows but they can get down pretty fast on lvl 1 cause you need only 2 tanq arrows and a cross bow/up so starters can see
It was actually really easy to tame! The one I tamed was distracted by a little dino and I shot him with narcotic arrows 4 times I believe and not even a stack of normal meat (I didn't use prime) and it took awhile, I gave mine a few narcotic 5-7 I believe hope this helps!