You can also do a 10% second home mortgage to buy another place and later turn it into a rental. 

That would be a separate mortgage and not what amounts to a second loan on your personal residence, which if you have spouses, they might not be that into. 

You can also use some low-down payment mortgage products to continue buying in your back yard while house hacking and renting to others. 

That way you can take advantage of the tenants paying down your mortgage and the appreciation of the property .Best of Luck.

Capital gains are calculated as:Sale Price - (Original Purchase Price + Capital Improvements + Selling Costs) - depreciation (if applicable) = Capital GainYour mortgage or HELOC balance does not affect this calculation—it only determines how much cash you take home after the sale.In Massachusetts, if the home was your primary residence for at least 2 out of the last 5 years, you may qualify for the Section 121 Exclusion, allowing you to exclude up to $250,000 (single) or $500,000 (married filing jointly) of the gain from federal capital gains tax.

Marketing to find what is a deal, $$ to fund that many deals along with utilities, mortgage payments, taxes, cost overruns, etc.

I'm looking more for an overarching portfolio spreadsheet to track asset performance over the lifetime of holding the asset.If you have the property manager paying the mortgages, taxes, insurances, doing all the accounting, etc why not just ask them to generate whatever report you want?

LLCs are ineligible for FHA loans and other government-sponsored mortgage programs

When your rental income is 1.5-2x the mortgage payment - as is typical for highly refined STR strategies - they're basically not concerned about the mortgage payment.

If you're going to need a mortgage, you're locked out of the game.