If your Offer lets you "review and approve" of leases, and you feel they are not as expected and decide you can't live with the turnover right after purchase, than can discuss backing out with your agent. 

Your attorney will review the contract, help with due diligence, and ensure that the closing process is handled properly.

I read a few reviews on an agent that came up on BP and they were not great. 

I’ll look further into the “subject to” approach and review the article you shared to better understand the potential risks and strategies.Gaining a seller’s confidence is definitely something I’ll keep in mind if I pursue this route.

They initially told me I didn't need to review the contract, as it was solely between the management company and the tenant.

There has been no noticeable difference between all 4, same income, same 5-star reviews. 

After reviewing your application, we’ve determined that we’re unable to move forward with the rental process at this time due to our screening criteria, which include credit-related factors.

Reviewing their product page it does appear the $25/month is base with the marginal $1/unit pricing after that. https://latchel.com/emergency/So more economical as the portfolio grows, though very curious Your XP once repairs are triggered since most after hours calls would be “surge pricing” for any contractor they bring in. in 15 years I’ve only had a few of the stereotypical “after hours broken toilet” calls, but I know that’s highly variable by location and property class.

Is it worth it to have my contracts drawn up, or at least reviewed by a Real Estate Attorney.

I had a demo call with Guesty and it looked good but I hear bad reviews about customer service and compatibility with VRBO.