Talk to some people, see what they are doing, and see if what you come across fits your goals and lifestyle.  

I ask them to ensure the apartment is in tip top showable condition, pay for advertising and pay rent until a suitable tenant that is properly vetted can be found, just as they were.

Properly screening and selecting the right person is the tricky part.

In order to minimize these taxes, it is important to make sure that all of your assets are properly documented and organized so that you can determine what would be best for your heirs.

If you do it, go all in and do it proper. 

Just properly document the movement of the funds.

You will find that (properly screened) Section 8 tenants can be far more appreciative of having a good Landord than a lot of cash tenants.Looks like your deal comes out to about $29K per door.

Percentages are great when properly used and understood, but they can also be tricky. 20% on a $100k property is very different from 20% on $600k.

Although, depending on your life style, you might need to have at least $1mil invested in dividend stocks to earn enough passive income to live comfortably. 

Agree mostly with @Yoann DoratIn our opinion, you can do Class C remotely, it's not easy, but NOT Class D.80%+ of property management can be done from anywhere you can get an internet connection - once you set up the proper systems.