Also for anyone else on this journey, I'm running Home Assistant in Docker within DSM. I ran into problems with my zigbee USB stick, in that Synology don't include the drivers for it in DSM 7. I found them here https://github.com/robertklep/dsm7-usb-serial-drivers. I got this going fine and everything was dandy, until I hooked up a USB card reader, which couldn't be mounted until I installed exFAT. Did that and all was good, but then following a reboot, DSM wouldn't come back online. I found removing the USB card reader resolved this, but my zigbee stick wouldn't mount anymore. After many hours searching for a solution, I removed exFAT and voila, working once again. I guess I'll just transfer files using network rather than plugging into the USB ports then.