I am on a PS4 PvE server and I can tell you by experience that they won't tame if you go offline. I had a lvl 95 with over 1k sulfur in it and torpor at 14400 with only about 5% to go and next morning he was still there, unconscious... but wild and no sulfur in his inventory. Unless you kibble tame, expect to spend a whole day waiting or it will be wasted time and materials.
For some reason, after the latest update, X-rock elementals (haven't checked other variants) are no longer tameable. Whenever you knock them out, they don't eat and don't have a taming bar. Forcetame also doesn't affect them, so I believe it's a glitch
To tame these turret soakers I’d recommend getting four metal gates 5 pillars 3 ceilings and 3 walls. For the trap and the pillars are supposed to prevent the golems rocks from hitting the cannon. AIM FOR THE HEAD