However, understanding their requirements—such as down payment percentages, reserve requirements, and loan-to-value ratios—is key to getting approved.One of the biggest advantages of working with portfolio lenders is their ability to fund deals that traditional banks might pass on.

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

I mention this as I have seen some people want to sue companies because they were a sponsored affiliate on a website…Regarding the original post- expect 10-12% (I think latest I saw is avg is 11.5%) rate plus atleast one point for a 12 month loan.Bigger companies may take longer for approval and can be more flexible usually in down payment amounts.

My thought is is use the Rent Ready feature of reporting his payment history to the credit bureau so it can work in his favor as a trade line, but I'm wondering if this is an unnecessary added step since he can already pull transactions on his bank side. 

Do you mean a down payment on a property??

I haven't heard of the bi-weekly credit card payment idea.

Don't just be enamored by double digit returns and definitely don't feel rushed into investing in any funds. 

I can’t say I came up with the idea, I saw a landlord with more units than I have post that they offered the holiday discount, bug only to their tenants who had made all their rent payments on time and in full over the course of the year.

Then you can talk to the mortgage company or payment processor yourself. 

I understand that if I rent this ADU out, then I can have a tax write off on the mortgage payment and insurance payment for the the ADU's sqft portion.