It is DSCR based and no personal tax returns are required to qualify.

If not, what are property tax sales? 

I assume they collect a proration every month for property tax?

I'm starting out doing redeemable tax deeds and going to auctions where everybody has "bigger pockets" than I do.

Weigh the long-term benefits of the low mortgage rate you have versus selling and getting $500k from a sale exempt from capital gains tax.

If you aren't familiar with Baltimore, I would suggest it's a hard no and say that you are trying too hard to make cash flow happen talking Baltimore and tax liens and auctions.

If you need financial help, ask under the "Finance, Tax, and Legal" forum.

The home burns and the incredibly over taxed CA FAIR plan has either gone bankrupt or takes years to pay out.2.

I'm going to reiterate what's already been mentioned above, but I'm going to actually give you examples of why it's relevant to you to find a U.S. tax professional.1 - You're going to need to file U.S. taxes once you have property down here, there's federal filings, state filings, and sometimes local filings too2 - Tons of tax treaties between the U.S. and Canada that are easy to miss and can cost you a lot of money (important one with rentals - effectively connected income - if the professional you talk to doesn't know what this is, run away)3 - The amount of days you spend in the U.S. needs to be tracked and if you go over a threshold, all of your worldwide income could be taxable by the U.S.4 - Selling real property means up to 15% of your sales proceeds might not be available to you for years (FIRPTA)5 - Lots of nuance at the state and local levels, which both want to take as much money from you as possibleMain takeaway here is that you should find a U.S. based tax person.

Since part of your property is a rental, I believe a portion of your mortgage interest should be a tax deduction unlike your other debt.