I use Linux on my laptop since >3 years ago, after having used a Macbook Pro for many years. My current laptop came with Windows preinstalled, and I decided to wipe it completely after reading the privacy policy (no dual boot, only Linux).

I haven't tested in depth dual monitor support, but it appears to work just fine. I don't know what is a portal monitor.

Maybe try first a live distro on USB to see if it works for you.