DaVinci Resolve 15 audio channel mapping

One question I can't find an easy answer: How the hell can I map 8 mono audio tracks to a 5.1 output and a stereo output? Fairlight made channel mapping COMPLETELY BONKERS!!
https://forum.blackmagicdesign.com/
https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=79250