I assume this is software?
My community is home to 19 different products and it’s very tricky. Only a small portion of our users have more than one product, which unfortunately results in silos of activity and almost sub-communities within.
Our rule of thumb at the beginning was that it’s better to silo things out like this to ensure people are only seeing/being alerted to content that’s applicable to them. People would quickly tune out if we had only one product news category, since only a sliver of topics would be relevant to them.
Your situation may be more similar to the community that I used to run, which had two products that were similar but very different (on-prem vs saas).
Feel free to ask any questions here or shoot me a DM/chat 