The Ankylosaurus will not attack you in the wild unless you attack first. When battling you can run away quite easily, just be aware, they have high health, so if you plan to kill one make sure you have enough stamina and resources to kill them.

Around mountains and in the southern areas, in general pretty common

Neutral wild, will only attack if provoked, mostly found in easier zones

I find the ankylosaurs is surprisingly a very good swimmer , or well good at floating and swimming it for submerging and going down ,but still better at submerging and going down than most dinos so I guess it could be used for oil but still , down try escape from one in water .