In Minnesota, an inspector is not required to have any licensing or certifications, although the best inspectors are ASHI-certified.  

But I currently own a tax lien certificate on the same property.

However, the legislature is working on a legal process that would address the certificate of ownership process for obtaining title for a manufactured home.

You should seek a Lender who can provide a formal Certificate of Approval Letter upfront and help Prequalify DSCR properties in advance to simplify the process. 

As for the insurance certificates- make sure you are actually being added as additional insured and not merely a certificate holders.

Attorney's Secrets to Tax Lien Certificate Investing and Tax Lien Sales Auctions (theinformedinvestor.com)Does anybody know if this is a good course?

I keep comparing to Aussie and other countries world wide.Buyers agents pretty much don't exist and only listing agents do.true, US is almost always the most complicated one, in other country no need to have buyer agent but there're more, no need to pay tax when selling house, no need to put all 2000 pages disclosure when selling house  , no need to have house with so many certification (required in some states ) before renting it out , no need to hire expensive licensed american-born General contractor when repair house, no need to call specialized licensed educated electrician / plumbing with ipod because it's just .... plumbing. no need to pay tax with annual increase .... no need to pay ridicilous amount of insurance every year no need to check their credit score and immigration status when renter is impying LOL the list is on and on

The slightly confusing part is the Business License Tax Certificate.

Ask for the application and screening reports like the credit report, background check and application.Check the property conditions - ask to see a copy of the lead certificate, rental license and rental inspection.

If there is no lead certificate on file with the state, you WILL need to delead, so use that in your negotiations.