Work with an experienced tax planner/strategist specializing in real estate and not merely a general tax preparer.

Make sure you get proof of actual rents and security deposits as verified by the tenants through estoppel certificates.

We both work remotely and are curious about how long we can stay at the rental before it becomes an issue, wether thats state tax implications or perhaps when our jobs should be notified that were working in WA vs OR?

Yes, they are. separate meters and property tax bills.  

If for example a home is selling for $225,000 it will have an estimate of $1,462/month.With 25% down the calculator shows: $1,023 per month Principal and interest $806Property taxes$125Homeowners insurance$92How can I get a better idea of the total including everything? 

But between my broker fee and the lenders fees, it's usually 2-3% of the loan amount.They're ignoring the $7k escrow for taxes and insurance, for example.

It would be same as saying you also owe future taxes and insurance.

Has anyone tried installing wifi locks and security cameras for their long term rental?

Even if I could secure a portfolio loan in the mid 7s it would cash flow with modest increases in rent.

This means expect tax increases, expect HOI increases, expect tenant issues, PM issues, capex issues, everything in between.