Someone with experience with visa holders being passive business owner and investor.

Keep that in mind if your walls have 'character',  I grab a gallon or 2 of mistints (I have about 80 acquired over time and also  mix like-bases) off my shelf, depending on the home and room being painted.  

I think it will depend how and who they grow up into.  

This is becoming more common but it's likely you could get full replacement cost elsewhere depending on the age. 

I quit my w2 cause I hit the .01% of success in it-- created small businesses then failed/succeeded on those.

You're income certainly isn't "normal" and some banks might shy away but this is a personal business and if you have a track record, I think you can find a bank to say yes.

You can typically pull 70-75% percent depending on property type, loan type.

IDKCurrently considering opening a FB business account and posting my rentals as a sponsored listing with an FB allowed link to my property manager's application webpage. 

I handle most of the forms and simpler legal tasks myself in my own REI business.  

They are offering a 12-15 month 0% APR Credit Business lines, isn’t hard money usually a higher interest rate?