Just thought I’d post a comment about my use of the Roon Extension Manager to install the web remote.
My setup is a QNAP NAS, with Roon installed from the QNAP AppCenter.
I installed the Extension Manager using the Docker container.
So that worked fine - Roon running on the host QNAP, the extension manager running inside a docker container.
I then installed the Web Remote.
It was installed of course inside the docker container. The web interface could not be accessed since there was no port mapped into the container.
I couldn’t map port 8080 since QNAP web interface uses it.
So I instead mapped 8088 on the host through to 8080 inside the container and that gave me access and it seems to work fine.