yeah it works fine on bare metal, you'll just have to do a bit more set up work yourself (https terminating and such). The installer script should be instructive in how to run it but you'll have to figure out the BSD specific stuff
Look into the service folder in the repo—this repo is just a very thin packaging wrapper for a JS library, which you should be able to run anywhere you can run Node.
I use BSD, and all I see is a installer for Debian/Ubuntu.
No guide in sight for bare metal nor telling you what services/software are required.