Which NAS for home rack

[Enquiries]

Thanks for the opportunity to ask a few questions and get some advice

Recently moved into a new home and I have fitted a wall rack to my office.

I have run CAT6 cables to various rooms (mainly 2 runs behind every TV), and terminated them in wall plates.

Have a UNIFI setup with a UDM SE in my rack and an XG 24 switch (arriving this week).

I also have an old QNAP TS-453A just sat at bottom of my rack, with 3 x 4Tb drives in which I currently just use for storage.

I am unsure what exactly to be looking at but a rackmount NAS would fit in nice to my setup.

I would want to take advantage of a great throughput from NAS to various devices and I want to be able to get PLEX setup and streaming from it.

All my TVs are wall mounted and 4k native resolution.

I hope thats no too brief an outline

10GBe , PLEX , hardware decoding , NVMe slots (Gen ??) , data backup/storage

Cheers
Steve