JD Guther, I appropriate the reminder and noted intricacies and multi-flavored approaches that there will be.

Although if all your looking for is maybe one or two more units the simpler method maybe to just try it on one of your properties so you get a flavor for what it is like before you commit your whole portfolio to being refinanced. 

A lot of people cut their teeth on house hacks and single families etc and grow till they have a war chest to make bold moves. 

The goal with this is to really test it so you are crystal clear on the number of calls you get and the flavor of those calls. 

I really like how you framed (and bolded!)

Sounds bold.

It simply unlocks or locks the door by actuating the bold lever.You can also purchase a wifi hot spot from a cell phone company and use Ring or another security camera to actually view them while they are in the property.

Really two flavors. 1) Someone that has the largest HELOC they can get to use as unemployment insurance. 2) someone has the largest HELOC they can get and peg it from day one. 

I was hoping to find some encouragement and some bold go getters with solutions and answers.

Not getting my hopes up about learning anything ...and fully prepared to have lots of people trying to sell me different flavors of snake oil.