At one point I talked to my financially advisor and he said that it would be smart for me to open a HELOC on the property, but not draw from it, except in the case of emergencies.  

Achieving a 15% yearly ROI in Tulum’s real estate market is exceptionally rare.When clients approach me wanting to invest in Tulum solely for high returns, I advise them to reconsider—unless they’re comfortable with a more realistic 5% return.

I don't have properties outside of Huntsville and Madison here with the exception of one in Guntersville.  

Each DSCR loan is separate and qualifies separately, so one doesn't necessarily affect the other except for the liquidity needed to close since you'll have multiple down payments/closing costs for each transaction.

Except for the super cheap-o $70 from Home Depot, they all work good.

If you could have the exact same mortgage you have now EXCEPT that it functioned like a line of credit (ie. you can put all of your income toward it, but then still have access when you need it), would you want that?

Except that it's not.

The volatility of bitcoin is not a factor at all (except in the 30 mins or so it takes to get the bitcoin transaction confirmed on the blockchain and exchanged for USD I guess).

Yes, @Bill B. has been exceptionally instructive!

Last house I did all the work myself except for drywall and insulation. 1150 square feet, down to the studs, everything new except the roof and I spent $66,000.