1270, -366 has about 2 or 3 scorpion roamers (NE side of the most North pyramid) 443, -710 has about 1 or 2 scorpion roamers (S of the Ravager Pit) 1100, -1100 didn't really see any roamers (NE of the Ravager Pit)
The best place I've found to get these guys is near the pit with the crag ravanger. Camp yourself at the northern exit from the katta-atiki tunnels (loc -130, -1130). From here, move NW over the ridge and you'll see several rhinoback beetles, scatterback scarabs, and hopefully some large scorpions. To check you're at the right spot, you'll see a crag ravager due north of you.
The beetles and scarabs are both PHers for the scorpions (the crag is Not).