Focus on expanding your deal sources, assembling a reliable team, and learning from every transaction to refine your process.Good luck!

And that comes down to how reliable they are at paying rent on time.

You're challenge will be finding someone reliable who will pay the rent on time and not cause problems or hassles for you. 

I did my due diligence, but when a company markets itself as a turnkey property expert, they should ensure the property is solid and their affiliates are reliable.

Just make sure they’re reliable and familiar with STR operations.

they probably have a bunch of 3% nonconforming loans on their balance sheet so 5.5% is not bad, totally reliable payments, plus in a legal battle they'd likely find the power of attorney didn't extend to the ridiculous term and that there was no breach of any enforceable agreement.   

Make sure you’re connected with reliable contractors and property managers who can act as your boots on the ground to keep everything running smoothly.

I also tried calling their support line for listings, but no one answered.To investigate further, I re-listed the property with identical information but without paying for the premium $29.99 option.

It's been a struggle for myself to find a reliable one. 

I don't have experience with the Detroit Land Bank, but generally land banks are pretty reliable, but...they are low money buys (from $1 to $1,000) that require you to show proof of funds for the rehab.