Also if you want specifically a NAS, get a prebuilt model from e.g. QNAP and it will come with a management interface already.

I got this one for $600:

https://www.amazon.com/gp/product/B08FB5LBJP

If you outgrow a 9-bay NAS, they also sell full storage servers with management.

I was very tempted to build a NAS too, but ultimately prebuilt was better I think.