I have two containers pointing to the same bind mount. I just had to manually edit the config files in /etc/pve/lxc so that both pointed to the same dataset. I have not had any issues, but you do have to pay attention to file permissions etc. I have one container that writes and the other is read only for the most part, so I don’t worry about file lock there. I did it this way because if I recall, you can’t do NFS shares within a container without giving it privileged status, and I didn’t want to do that.