Favorable Tenant/landlord laws, no income tax, low property tax, consistent job growth, tech coming in, etc. 

It will cost hundreds of K just to get it operational...Insurance, property taxes, plenty of carry costs

It's one thing to never fall in love with your properties...however, I do fall in love with the tax rate on some of my legacy properties purchased right after the GFC.

I agree with @Mario Dattilo and Roger D Jones.I think the only thing that I would draw emphasis on is what Mario said because unless it has a separate tax ID number it is not an apples-to-apples comparable.

I watched as cheap cash cars were bought with income tax every few years when they got too expensive to maintain.

I am looking to start investing into Tax Lien Certificates/Deeds, but I don't know which way to go. 

I get where your coming from but the point of an LLC is that it keeps the asset protected from all others so in a sense the holding company is just a formality for tax purposes since an s-corp would be attached.If you do a separate llc for each property without a holding company then you would have to make a separate s corp for each property which wouldn't make sense as that defeats the purpose of the s-corp thus the reason for the holding company.

Accounting for the utilities, taxes, closing costs, etc...

If they purchase a house in your area, you could have the judgment attached to the property (I have done this before).Lastly, I have heard that you can 1099 them so they could be forced to pay taxes on it.

DSCR loans look at you liquidity position, credit score, and the rent vs principal, interest, taxes, and insurance.