Hello Jigang, there are quite a few investors who buy homes and then hire a property manager to take care of the day-to-day business related to the home. Some of these investors do not live in the same area or city, or even in the same state. There might be someone in California buying in Houston because it meets their investing requirements. While not everyone hires a property manager, it does help to have one, so someone in your position knows that whatever needs to be taken care of, is addressed appropriately. There are many agents who manage properties as well. When you hire a property manager, they are obligated to take care of your property so there are no issues and the tenant is taken care of. I would suggest that you talk to a few and see which ones you are comfortable with, before you select someone.
What exactly are you looking for and which area are you interested in?