The Note8 is rootable via XDA member me2151's SamFAIL utility, and (as you'd expect) there are plenty of caveats. It doesn't trip Knox, but it does break SafetyNet. Even worse, it requires a secure boot image that precludes Magisk compatibility as well so you won't be able to bypass the SafetyNet issue. You will also only be able to charge your Note8 up to 80% of its original capacity, and the installation process will wipe your internal storage, so be sure to back everything up before you attempt it.