Basically, I want to make sure that my tenants will be able to pay if one of them ups and leaves, disappears, or gets hit by a bus.Is it ok to require minimum income of 5x for household and let's say 2x for individual?

I agree with @Joel Owens on the financing side, basically as long a term as possible. 

Here is the basic criteria (learned from watching video on BP) I use: https://www.zillow.com/homes/for_sale/Phoenix-AZ/fsba_lt/apartment_duplex_type/7690658_zpid/40326_rid/0-150000_price/0-605_mp/Duplex_att/pricea_sort/34.112941,-111.386261,33.096143,-112.862549_rect/9_zm/0_mmm/Income:Expenses:TaxInsuranceUtilities:Repairs:Cap ExP.MMortgage:Misc: Cash Flow:Cash/Cash NOI: 

Some basics, House is 3-4 bedrooms 2 bath, old house with original wood work (pretty nice).

But basically the houses were listed for a few months and had a few price cuts and eventually been sold below the asking price.

It also mentions what the recourse is if you stop paying.A non performing note is basically a promissory note where the person stopped paying.

It is basically: you buy a home and live in it, rent out rooms (other units if multi family), and have the renters pay the majority of the mortgage, leaving you with extra $$ compared to the avg market rent for where you live.

When I’ve run my numbers on single family vs a duplex for say 70-90k in Cleveland with these extra costs I find the cash flow numbers are basically the same.

Then you can pull all your cash (purchase + repairs) out of it and have a rental for basically "0" down. 

However, it doesn't allow me to easily point a tenant to a link, fill in some basic info (credit, move in date, etc.) information and request a showing time.