It depends, and each rental property has to qualify separately and on it's own. Basically, if you spend more than 250 hours directly involved in that rental, then it qualifies. But with three rentals that would be 250 hours each for a total of 750 hours to qualify for all three. That means you spend at least 15 hours a week involved in the rentals. Now if you qualify for all three that would qualify you as a real estate professional. Very doubtful since you have a full time job as a software consultant. Note also that record keeping time does not count for this, as there is a difference between "involved" in the rental, and "managing" the rental.
I too have three rentals and don't come anywhere close to qualifying for the QBI on any of them. I'm lucky if I spend 15 hours a year involved in all three of my rentals, combined.
