Is TP qualifying with 250 hours on each rental separately, or collectively?

In the QBID section of each rental there is an input for "Rental real estate enterprise number if claiming safe harbor" You may use the same number for all (collectively) or a new number for each rental (separately). 

Here is the info for that field from Lacerte

"Enter the rental real estate enterprise number to claim the safe harbor treatment under Rev. Proc. 2019-38. To be eligible, separate books and records must be maintained for each property, 250 or more hours of rental services must be performed, and the property may not be rented under a triple net lease agreement."

Aggregation is a different animal. Input for it is a bit lower and have more parts. Here is the Lacerte help for aggregation number

"Enter a number to aggregate two or more businesses. All businesses with the same number will be aggregated together.

NOTE: SSTBs may not be aggregated. See Publication 535 for more information."