What's a good way to test a website that runs on edge nodes?

I have a little web app running on Deno Deploy and I want to see how it handles people connecting from multiple regions. There's a BroadcastChannel class that lets you send messages to any servers running in other regions, but to test it, I need to make connections in multiple regions, so there's more than one server running.

What are good ways to test this, either interactively or by writing tests? Maybe use a VPN? What's your favorite?