They are very good at climbing up rocks and other steep areas as long as therea a good slope to start at and its not perfectly straight. You can use this for hit and run when doing tames, or a good escape if needed. Their speed isn't too great but their stamina is pretty good. And they aren't the best at actually killing, but their torpor attacks make up for that.
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.)