Most people who seem know what they're doing recommend Mullvad and Proton.
I'm using Proton, because I use the mail as a backup, and have never had a notification. Notifications can be controlled in the account page. The IPv6 isn't complete on Proton yet. My downloaded WireGuard configuration files for UniFi didn't include IPv6.
That said, your two or three notifications in a month isn't really a lot.