I use a generic custom domain. Like @tangomail.com. I’ve enabled catch-all on that domain and create aliases on the fly.
Prior to that I’ve used Simple Login, AnonAddy and DuckDuckGo E-mail Protection. I’ve used DDG the longest, and the only thing I miss was a dashboard.
Proton Drive client for macOS is on beta right now.
https://proton.me/blog/proton-drive-windows