The level of service you will most likely get using "flat fee" services will be best described as "half-assed", you probably already know that, and the lackadaisical approach may lead your property to have negative exposure instead of the positive exposure it needs.

I purchased a duple thats is fixer upper!

I don't know your experience level in real estate so I'll leave it at that.  

@David Ounanian I don't think they do any formal screening, but they lay out their tenant requirements clearly on the site where people can schedule appointments and they ask three questions about income level, felonies, and past problems with landlords.

Figure out what niche you want to try and/or are interested in and find someone who is doing it at a high level and find out if they are hiring at all.

I am interested in achieving some level of financial independence with "house hacking," which seems entirely doable in Philadelphia but not so much in Phoenix.

So looking around at listings, it seems that there are a few fixer-uppers listed in nearby Hammond, IN under $50k. 

Two identical MH properties (or even the trailers themselves) purchased differently by two different investors could have vastly different levels of success.

One can spend hours talking about risks.At a high level you can remove all risks by doing 2 things 1) Adding disclaimer when you sell AND/OR 2) Doing double close aka you buy first and then you sell. 

I think it just depends on your tolerance level and the terms of the deal.