I tamed my eerie male scorpion on ark mobile during the eerie server event inside the poison cave. It was the best choice I ever made as he is now guarding my hatchery.

On mobile I recommend the following for stats if you plan to use a scorpion as a guard.

Speed is good at 230%
Melee at about 500% (just to keep those nasty wild Dinos spawning in your base in line)
Health about 5k (scorpions can be very easily killed if they don’t have good health in them.)

If you have an enclosed base, put a couple of these with high health inside on aggressive to give a raiders a particularly nasty surprise.

Upgrade melee for more torpity per hit

When I was a fresh noob to ark I'd tame 3 scorps. I'd ride one and have the other 2 set to follow and there wasn't anything that could stop us