Property structure for multi-subdomain website

I'vre recently started to work with a website that has plenty of subdomains based on regional departments of the company. They work separately and each one has its own GA property.

I'm going to create another property to collect shared data for all of the subdomains. But I'm concerned on two points: 1) are there any caveats? 2) should I share data from existing google tags or install 2 google tags for each subdomain (local + shared) ?