Check out windscribe, they have port forwarding. Proton is great too. If you're on windows setting up port forwarding with their app is a breeze vs Linux which they are developing better at current.
Depending on your routers capabilities. I have my VPN on my router and chose which device gets behind it or not. Works like a charm. If you want to access your server from outside your local network, you have to see if express vpn offers port forwarding.
What you can do is set the same root folder for them all, and tell the different *arrs to use sub folders, then use the root folder as a catch all. I can’t remember how to set it up off the top of my head, but I remember that it was pretty simple. <
This is the way I'm set up. One downloads folder and two folders for Sonarr and Radarr respectively that are mapped by them. How do you mean use the root folder as catch up?
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