Safe Harbor on Two Multi Families, One Partially Owner Occupied, the Other Investment

I own a 3 family house which is an investment property.  I also own a 2 family house in which one unit is rented and the other is my residence.

 

I would like to claim the QBI deduction.  Should I use safe harbor on each property individually or combined?  Or should I handle this another way?

 

Thanks,

Moses