A good Accountant or Bookkeeper will work with you to tie out all your accounts and let you know any issues or advice as it comes up throughout the year.I would be more than happy to chat with you more about your finances, I was one of the few Bookkeepers to be invited to BiggerPocket's Financial Service offers and have been working with them on ways to improve it as I help more and more investors with their Books. 

Make sure it explicitly explains the process for termination if you are unhappy with their services, especially if they violate the terms of your agreement.3.

Taking the market rents, accounting for a 10% vacancy, the debt service, PM fees and everything else, it seems like I should be able to cash flow about $600 for the 4 doors combined.

As a Stessa Pro member, I rely heavily on its features to manage my properties, and while sending over the tax package reports works well (since the Income Statement and Balance Sheet are standard for most accountants), my bigger challenge has been finding a real estate-savvy CPA who doesn’t charge more than my annual cash flow for their services!

80 LTV should be doable as long as it's debt servicing.

I know one property manager nearby who charges $30/month for such a service.

I realize this is a complex concern so just looking for general advice here based on the experiences of others.I would manage bookings and client communications aside from maybe an on call service for at night.

Quote from @Ran Fridman: Hi, I'm Ran Fridman, I am a Property Manager in Indiana, Wisconsin and Illinois, for many successful years of servicing Happy Landlords and Tenants. 

Their product was deemed an essential service and the preferred return would be cumulative.

When you get to PM companies that are 100++ units they typically have in house handyman services that do it all so they might not have the connections that you need.The next move is going to local REI meetups...