I've just watched the "gator method" today.

I'd simply explain they can use Zelle until the renewal, then the portal will be the preferred method.

What are the best methods for finding potential properties outside of the MLS?

If you have a truly superior and/or unique product it will be easier to not have to compete with price. 

Look at just today, everyone thought stock market this year was going to rocket then china comes out with AI allegedly superior to ours and tanks tech stocks.

The ADU cannot be superior to the primary residence.

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We've found it has superior reporting features, integration features, and is overall more efficient to work within than other REI-specific software.The downside is QBO is not set up for REI so you'll need to do that or work with an expert to ensure it is set up for your business appropriately.

I also would like to get into the BRRRR method.

If they are relatively the same but offer a front desk etc maybe they are superior.