My QNAP TS-251A has died. Thinking about the UGREEN DXP2800

Hi, my QNAP TS-251A has died and I can't seem to revive it. The lights on the back come on, showing power is going into the device and the internet light is orange, I think, and the internet activity light is flashing yellow, but it won't power on. Removed both hard drives and still won't power on. A google search reveals it's a common problem and the unit is probably dead :(

So, I now need to find a new 2 Bay NAS for home use. I mainly use the NAS to back up my MacBook Pro (which has a 2TB drive) and storage for my photos/music. May want to also use it to back up another Windows laptop that we use.

In the QNAP I have 2 Seagate Ironwolf 14TB drives in a raid setup, so the second drive provides a mirror of the first and acts as a 2nd back up. Not really an expert in these things but I think that is how it works.

I was looking for another 2 bay drive to buy and of course there is the QNAP TS-264-8G, which may be an easier solution to migrate too, but not sure on that, but I assume that it will handle whatever is needed, but I think that the TS-264 has a different operating system, so maybe it won't be so straight forward.

The other option is the UGREEN DXP2800 which seems to get good reviews. What worries me about going to this option is how I would need to set up my current hard drives to work. I don't think it will be straight forward, more so as my QNAP is dead and I don't really have a way to access the 2 drives that are in the QNAP.

So, if I was to go the UGREEN route, how would I ensure a successful migration of my data? In addition to the 2 14TB drives I also have 2 6TB WD drives that were used in my QNAP NAS at one point, so those are 2 spare drives, but again, I don't have a way to access these drives. If anyone has gone through something like this I'd love to hear your experience, how difficult it was, what you needed, etc. I only have my MacBook Pro and a windows laptop, so how can I even access my hard drives?