I have sold two properties on seller finance, but I don't buy on seller finance, but I know a lot more about it than you do.Again, on the pocket listings, if you are referring to 10 units and up, I agree that it's not at 1/10.

They become advocates, eager to refer others to join our network.

@Spencer DixonRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder (BiggerPockets: The Real Estate Investing Social Network), etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

Quote from @Zach Edelman: Should be a list of Bigger Pockets recommended list of Hard Money Lenders to refer to as well/make the search a bit less overwhelming.  

This is a website that was mentioned in BP Money Podcast EP 303.

This is the class of property that I'm referring to when I talk about very high tenant demand and low vacancy. 

Here's my slidedeck on MTRs which is basically what you're referring too.

Marketing directs potential home buyers to their websites.

According to a 2016 tax sale for Anne Arundel county, MD process document the rate is now 12% from there website.

I can refer a couple of great PM's in Orlando if you want to get another opinion or two.