Unless something has changed recently, I’m pretty sure the ova from the official github would work just fine.
… and someone has confirmed ova would work:
(Looks like the install guide above has got some nice updates / rewrites since July 2020. Check the HAOS section under the “alternative” route)
… and here’s the guy who said he got things up and running w/in minutes (or was it seconds?):
= = = =
Yes there’s also docker container install option via QNAP Container Station. But assuming your QNAP could do VM, I’d recommend we just do Home Assistant OS via QNAP Virtualization Station 3 using the ova image.