I would second the simple spreadsheet.

Quote from @Loren Souers: A simple spreadsheet would suffice.

Really simple process to get a term sheet and no upfront fees except appraisal cost that is paid DIRECTLY to the appraisal company.

Speaking from hands on experience on both platforms as I've worked with both Carrot and Wordpress sites (more than 400 sites so far since 2017), what carrot brings into the table is their simple, all in one, fast website platform.

Personally, I would start simple with a single family. 

If you have ever learned something important by trial and error, then you can probably understand the frustration that you feel when you make a "rookie mistake" or a simple error that creates a big negative result.

And remember the REI Simple Program that you signed up for but didn’t use?

Speaking from hands on experience on both platforms as I've worked with both Carrot and Wordpress sites (more than 400 sites so far since 2017), what carrot brings into the table is their simple, all in one, fast website platform.

What I'm really looking for is a simple platform where my tenant can pay rent online rather than send in a physical check every month (their current system...).

The truth is that if you find the right deal, you can make pretty much any market work but if you are looking for consistent deal success that narrows your options down.Some investors look for simple signs like the "Chick-Fil-A" test.