Flatter tends to be better, but even then you need to make sure the soil is stable to support your structures.  

What's wrong with applicant #3?

Once you start to find something wrong with almost every deal but finally find one that really makes sense, run it by your mentor to see if they agree it is a good deal.

(other than the seller financing stuff because I've asked and nobody seems to be interested)You’re looking at the wrong stuff!  

Is it wrong for me to end his lease considering he has a infant?

Quote from @Christian Pichardo: Hey all, I am new to long-distance real estate investing and probably did everything wrong on my first investment property. 

Now that we are 5 months into it, we can see how wrong the reporting actually was, because there haven't really been any noticeable changes except minor procedural ones.  

Consider all the things that could go wrong and see if the lease addresses them: unauthorized pets or tenants, early termination, security deposit, lease violations, late rent, eviction, lawn maintenance, parking, etc.5.

What happens if the box shows up wrong or damaged?

It also serves as a great example of what I tell my college age daughters - email/text is a very hard place to have serious conversations without at least one person getting rubbed the wrong way by what can be inadvertent phrasing by the other party.