How does Nvidia GPU works on Qubes

I have some questions regarding the NitroPC pro 2:

  1. Do you have any guarantees for the compatibilities with future releases of QubesOS? If so, is there any delay/s after the official releases of Qubes?
  2. Can you please describe how Nvidia 4070 could be used with Qubes on NitroPC pro 2? I didn’t find any relevant info regarding this. It’s obviously a passthrough to individual qubes, but how exactly would it work, please? With all due respect, I don’t want to waste over a thousand dollars just to test things out.
  3. For countries outside the EU, if there’s a suspect of hardware issue, do you take care of the shipping costs or is it on the customer? Or maybe you have some other option for this?