Proton VPN (linux) and port forwarding question

I'm thinking of moving from Mullvad to ProtonVPN mainly for the port forwarding, but I have some questions. The documentation on the ProtonVPN website is dated and I don't know if it's still accurate.

Can you forward multiple ports simultaneously using the ProtonVPN linux app? The documentation also seems to suggest that the forwarded port will change every time I disconnect or reconnect the VPN, necessitating a change in my (ahem) clients' configurations, is that actually the case? If it's not possible to port forward multiple ports at once, can the linux app do split tunneling of my Plex server that's started at boot time?

Thanks to anyone who can answer any of these questions.