This will skip the step of having to deal with hand written sign ins.

I can also hold and rent, but not a crazy amount of cashflow

I think it makes sense this can be overcome with regular maintenance, easy communication where a tenant can report issues, having a inspection checklist, and potentially warning tenants of hazardous areas in their lease agreementNegligence on the other hand - how many inspections do we need a year?

Year 1, cash on cash return at 9.46% Over the next 10 years, here are the projected overall returns with 5% year over year rent growth, 3% year over year appreciation of the property, and calculations for tax savings + debt pay down: I'm a buy and hold investor.

. § 1.469-9(g) to treat all interests in rental real estate as a single rental real estate activity, and the taxpayer holds at least one interest in rental real estate as a limited partnership interest (as defined in Reg. § 1.469-5T(e)(3), the combined rental real estate activity is treated as a limited partnership interest of the taxpayer for purposes of determining material participation. 

The good thing is that at least your property will gain appreciation so its great for long term hold.

We are looking at possibly using capital stacking to fund holding costs and a light rehab for a sub to property we own.

If you don't want to have to cut/rotate the keys (by using a rekey lock/tool) then I'd opt for the smart lock hands down.

You can also expect that you will have a handful of paperwork to complete and receiving your 1st payment could take a month, as they have to enter you into the system and likely have set pay out dates.

It's also helpful to have pay stubs and a W-2 form on hand to bolster your mortgage application.