I'd revisit that assumption if you have not priced out PM in your market.Maintenance and reserves - These are highly debated items on BP, especially reserves; so, I am not going to go deep here but I would suggest that $720/unit combined for maintenance and cap ex is too low.  

This translates to the owner being motivated to offload the property for various personal reasons OR the house needing work (or a combination of both).

If the zoning allows a duplex (which I doubt it does), you could just combine the lots.

As long as they are painted over and encapsulated with modern paint, you should be fine.  

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Combine both mortgages on lower interest rate.

Likewise, the instructions to Form 8825 state that each rental property is to be shown separately on the Form 8825, even if the activities are combined for purposes of the passive activity rules. 

We have built modern homes, and I appreciate the clean lines, white, etc., however; you can add some character in the way of texture and add some warmth in other areas (the floor, a more rustic coffee table, etc.)  

Your positive cash flow is $840/month, a one month vacancy on tenant turnover combined with the need for interior paint and maybe a few other repairs/upgrades will wipe out more than one third of a year's income. 

Just be aware that if you are using a DSCR or investment purpose loan in combination with your HELOC.