I found a spot on the SE edge of the Volcnic biome that has am "island" with a tiny moat like spot. Any area on that edge of the map will work. The "island" is about 2x2 foundations and has a nice straight run path on one side and a small hill on the other.
Pull the Lava golem out of the volcano carefully to not bump the bottom of the skiff as then you will drop it under the map. the golem itself can dip under the terrain a bit however. You need to go out the largest crystal tunnel that leads to the big lava lake. and then fly over the lake to the south exit from the volcano. Once you Arrive put it down a ways away from the 'island'. Park the skiff behind the hill.
You need to have built a large hangman that you can grapple or dangle a spider just above the top of the golem's head. This will freeze the golem in place. Then just use a seige cannon on a Mek to K.O. it. You can build a metal trap using dino gates, but you end up with a golem punching them and have to time your shots.
It's a bit silly that kibble tames it a lot better than rocks or sulfur because even in the dossier it says that it lives off of absorbing nearby rocks and minerals. So mabey they should make it so you have to feed them a rare mineral like obsidian what if they made it so you could tame one fast and with high effectiveness by giving one a few hundred or few thousand obsidian . or what if there kibble was made out of a combination of ores and minerals .