If you were more knowledgeable about the process, as indicated by representative questions, I would say you could go your own way, but even then, considering the commitments, a Realtor can bring excellent value.  

If you are going to complete the BRRRR method in a lower tier neighborhood, select a neighborhood with the fundamentals that indicate the neighborhood will transition to a neighborhood where home ownership will become more prevalent.

If there's any indication this is a high-risk situation, then I would require two months of rent as a deposit.

Wondering if they are as effective as the website indicates and if they are worth the purchase and ongoing costs?

I agree, seeing migration patterns coupled with insurance costs and insurability might be a good macro-economic indicator.

Can the lender still file the lien after-the-fact as long as the promissory note clearly indicated that the intent was for the subject property to be collateral?

Performance Tracking- Monitoring Metrics: We keep an eye on key performance indicators to find areas for improvement and make adjustments.- Managing Cancellations: We review cancellation patterns to minimize future issues.While managing short-term rentals may seem simple to some, it can be a lot of work behind the scenes to ensure every detail is optimized.

And Facebook indicated that they have read my messages.

She indicated she would do the second needed appraisal. 

That was on Friday June 14th, 72 hours would have been Monday June 17th, and as of this moment there is nothing on my Home Depot Pro account profile that indicates Elite pricing.