is there a reason why you are not running a full HAOS VMware install under VMM on your DS918+? I’ve been running it on mine this way for a few years, and it is completely painless other than needing to re-attach the USB port to the VM whenever the Synology reboots.
I should throw in a disclaimer that I’m still running my 918+ on DSM6, and have not tested under DSM7…
The config would be located there. Where do you go to to start and stop the container? Are you using the Synology UI? A docker run command? Do you also have zwavejsui installed? What version of Home Asisstanf?
Running docker is more complicated than using a VM, so the alternative to consider is to switch to VM. I run in Docker but I’m also a software engineer.