Question about "Validate Data" with multi-tenant db

I’m guessing the Validate Data will not work if I’m trying to allow each tenant to have a unique instance of a value.

For example, each tenant will store their companies in the “Company” table. Each of them could have a Google, but I only want them to be able to add Google once. So there could be many Googles, but only one for each tenant.

I believe the Validate Data step would not work in this example, so should I use a condition instead or is there a simpler way to check?