I agree with @Kevin Sobilo with some additional thoughts from my experience thrown in for good measure. 

Stessa imposes no fees for either landlords or tenants to use online rent collection, and it offers strong security measures to protect both parties’ personal and financial information.

What does the sufficiency test measure?

The problem is there is not a lot  of inventory ( small multifamily homes) in my area. im looking for advice on what measures i should take to take the leap if i don't have anything t work with. 

Once you're clear on that, I would make a 5 year vision, and then you can start writing down SMART (specific, measurable, achievable, relevant, time-bound) goals as milestones to help you get to that vision. 

I agree with Micheal in terms of calculating your cap-ex, reserves, and property expenses (excluding mortgage and insurance) to measure your ROI against your goals. 

I'm not concerned about Innago's security measures.

What we do know, and can measure right now, is an increasing demand for housing that is not able to keep up with the population trends. 

But as I stated many years ago when I was on the BP Podcast, that the biggest mistake investors make is an inability to properly understand and measure risk, and thus they deploy their capital into assets that do not match their personal risk tolerance. 

This measures the return on investment for a rental property, taking into account both rental income and expenses.Price-to-Rent Ratio: This is another metric that can help you evaluate the potential profitability of rental properties.