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.)
Scorpions make a great early seafaring mount if you hold the jump key ( space bar by default) a scorpion will float above the water allowing you to get past most Puranas without being attacked, this can be extremely useful for crossing dangerous rivers or even oceans.
Very effective as a battle mount/travelling companion. I mostly play on single player so an effective companion is vital. I tamed my Kopiona when she was level 32...she's at 62 now with 200% melee damage, over 800 health and quite a few surprising kills notched into her tail.
Some noteworthy accomplishments (without my assistance) are:
-1 Carno killed (lvl 30)
-1 Spino (lvls 3)
-1 pack of 4 Raptors (lvls 36, 24, 18, and 50)
-Survived a Rex attack (lvl 24) after I had died with minimal health loss.
Coupled with its torpor inducing attacks, it's also great as a taming mount.