They allow you to get funds at more favorable terms than with a loan or credit card.

Do I write the LLC a W-9 and write a check from the LLC into a personal account for tracking purposes? 

I put my criteria clearly in the listing: 3x income over rent, 85% on-time payment history on credit report, and good references from past landlord.The biggest mistake you can make is taking the word of a current landlord.

They care more about the asset value than your own credit history.

So my other options were to use my good credit but of course all of the loans want to use my personal credit and impact my debt-to-income.

Keep in mind its end of year pretty much every seller and builder is offering a 2% seller credit its the norm.$50K in earnest is a lot and if the lender drops the ball are you positive they can get the credit denial out in time to refund the earnest?  

No eviction protection so since you gave to settle on someone with and low 600s credit score if you have to go to court they get to charge for their time on that. 

It seems to be tracking status of the areas, which if there's still momentum in those areas could help situate someone for future growth. 

Start working on your credit score and research financing options, including FHA or conventional loans.

My suggestion is to look for someone with a strong track record in investment properties, ideally someone who has successful investments themselves.