I’m not familiar with Zurg, but the WebDAV connection makes me recall: doesn’t LXC require that the FUSE kernel module be loaded in order to use WebDAV?
I’ve also seen it recommended that WebDAV be setup on the host and then the mount points bind mounted into the container. Not sure if any of that helps, but maybe it’ll lead you somewhere.
I’m not sure if this what you’re after, but it sounded to me that you were describing monitoring. Might be worth your checking out librenms or zabbix or checkmk. Those would give you a good overview of the health of your stuff and keep track of what’s where.