Collecting rents is an art and a science.What you should depends on where they are with their late rents.

It just depends.

Wise lenders have borrowers sign legal agreements and have them provide collateral that is worth more than the amount of the loan in case the borrower doesn't make the promised payments on the loan.

Depends on the bank!

In return for excellent service I'll be offering repeat business and I'll happily provide referrals to my existing investor network for those top performers. 

Although your message is from a while back, I'm happy to provide an update.

The company providing the warranty keeps most premiums as revenue and profit."

If a HELOC isn’t an option, alternatives like a home equity loan, business line of credit, or a DSCR loan could work depending on your situation.

The amount of capital required from your savings to purchase multiple properties depends on the appreciation rates.

It really depends.