If you are on a pvp server(pve works as well), and you're raiding someone, try to use the rhino's charge attack. If your opponent has a rex, and you hit it with a full charge meter, it will be an instakill.
Ez tame even for early game , just use 4 billboards, put around rhino when still unaggro and then when the rhino is trapped with the billaboards just start shooting tranqs . ( Can use wooden billaboards)
With a good run up even a low level rhino can one-shot an alpha raptor, bring a good pick or chainsaw and a hapyaenodon with meatpacks or a shoulder-pet with preserving salts to get all the tasty prime meat and cook it for food or use it to tame big carnivores
On survival evolved all you need is tranq arrows a dino that you can shoot while riding it, and its preferred kibble or meoberries. Mainly I would do the kibble because meoberries take a long time to tame it and wastes alot of narcotics.
When KOing just run in circles filling it with tranq arrows or darts(high level) this is the way to cheese this Dino’s taming. Even someone that just got into a world with good movement speed could do it easy. And the Dino’s are super op when fully charged. This will help ALOT :)