I do believe that one enterprise means your aggregating them. however certain rental activities cannot be aggregated. example residential and commercial real estate cannot be aggregated.
in the schedule E worksheet
in the QBI section
there's a question in the QBI smart worksheet about Rev Proc 2019-38 the safe harbor election
A1a which you can check if you meet the safe harbor for that property that would be enterprise 1
for others if they meet the safe harbor but you don't want them aggregated you would check the box but use 2,3, or 4 for the enterprise number
for each for which you do this there will be the RREE safe harbor statement. there will also be a component QBI worksheet for each enterprise. finally form 8995 will list each enterprise as on a separate line.
