Wretched Hive of Scum & Villainy
This game won’t reach high level. Although it’s not formally Pathfinder E6, it might as well be, because the chances of me still running this game beyond 6th level are miniscule.
Because of that, few (if any) NPCs will be higher than 6th level either. Higher CR monsters may well exist, however. Be careful what you pick a fight with. It may not be “balanced” for your level!