Ok first you should start with a low level cos a low one is better than non! Build pillars around it to block its way of getting to you. Build rocket launchers (2 for a level 4) and just start to hit its head. Makes sure you time it right otherwise it won't do torpor if it hits the body.
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