Account level event dataset for B2B RT-CDP usecase

I have created the following schemas for a B2B RT-CDP usecase:

(1) individual profile schema for person level demographics

(2)Business account schema

(3)XDM Business Account Person Relation schema which links 1 and 2

(4)One event dataset at person level

(5)Another event dataset at account level. This has multiple event records aggregated at account level, with timestamp field. There is no person level field.

For dataset (5), should we use account id as the primary identity? Will it create issues with identity graph because other datasets are at person level? If not, how to still use this dataset for RT-CDP segments? Since primary identity is  mandatory to enable profile.