Extremely easy to tame, use whatever method you want. Make an army of ten or more to defend your starter base, and use a feeding trough to feed them all. Keep growing your dilo army, it's easy and you can always tame more and more and before you know it you have hundreds of lvl 100+ dilos.
They're cannon fodder, like the grunts in halo. They're weak and useless with just a couple but get a swarm of dilos and you'll be able to kill most dinos you encounter early game except for like rexes and spinos