And my IMPRESSION is that with MTR you are getting 1) traveling professionals (nurses) 2) relocating professionals 3) Insurance company temp housing for claimant remodels. 

Do yourself a favor and find an expert on your particular system -- that might not necessarily mean one of the big name companies.

I personally use a company called swift permits.

One risk I could think of is - Even witb a 20 year guaranteed lease, thr company could bankrupt & may put me in a situation to look for a tenant.

If you're a relatively new multifamily operator, you'll likely be required to hire a professional management company (inexperienced owners are typically not allowed to self manage the assets).

You can use the Bigger Pockets management finder tool to look up MTR management companies in the area and then I have a few recs I can provide if you are interested.Shoot me a message if you would like to discuss further and I can help you strategize to make sure you make the best decision possible!

Do you hire a title company for all the properties you're interested in before the auction?

You can always hire a different PM company.

Plus the mortgage company probably calls the loan, and if you can't pay it off then you can lose the property.

Most PMC's will add extra fees to help the company make some extra revenue.