It's a little difficult to get a detailed answer here. If you have the conditions, you can go to the unit for a field trip and see who is around the unit, such as doormen, security guards and shopkeepers. Maybe you can learn something, and it is best to know the employees of the unit. This information is more objective and true. Personal experience for reference, say your own point of view. After all, I'm not in your environment, so it's hard to avoid thinking wrong and saying wrong.