In case this helps someone: installing roon on fedora 34

[mysticalgator]

@Robert_Holloway

then this is the bit that had me stumped for a bit, but solved it:
sudo nano /etc/systemd/system/roonserver.service
find where it says:
ExecStart=/opt/RoonServer/start.sh
change to
ExecStart=/bin/bash /opt/RoonServer/start.sh

this is the SELinux issue that was pointed out earlier in this response. In a nutshell, you need to allow RoonServer in SELinux:

sudo restorecon -rv /opt/RoonServer

and restart the service, it will not require modifications in either the shell script or the roonserver.service file.

I have basically the same script as you did and I feed it into a virtual machine manager, I can post my Fedora 34 updated setup, hopefully over the weekend.