I was flying my pteranodon, and i saw a lvl 27 rex pick on one of these lil cuties. He curled up into a ball, and took no damage, so combined with its mining capabilities, this lil guy is perfect for the mountains, as they have incredible defense, and mining capabilities.
If taming any level the best way for a quick tame under 10 or 20 mins depends on what your tame food is. Damage it until it curls up, run a few meters away wait for it to roll out and then start Tranquilizing it.
Lots of these spawn on fars peak. Best Dino in the game in terms of being a utility Dino. Paired with a beaver and you can build a giant base in hours instead of days. Highly recommend this for low and high leveled players. Weight boosting while it levels up!