Meraki assigning multiple public ips to internal routers

So we're going to have one fibre line into our building leading into an mx250.

Currently working out how to assign the public ip addresses we have through that line to the various businesses in the building.

Each business should have its own public ip address assigned to their own router.

Rudimentary map here: https://i.imgur.com/cI6dSWg.jpg

Had a look into NAT but not sure that's the right solution.

I'm a bit of a networking newbie, so any pointers into the right protocol to be using that would be highly appreciated.