Really? I currently sit like 3’ from my current PC NAS, and while I can hear it, the fan noise seems louder (stock AMD heatsink and fan). This YouTube looks at very similar drives to what I have (my drives are WD 8TB NAS Plus 5400RPM, video is 8TB NAS Pro 7200), and the measurement is something like 10-15DB per drive. Mine should be quieter than the video, so I think it’ll be fine.
I’ll probably need to replace my drives soon since I got them 5 years ago (though they were off 80% of the time), so I may consider SSDs if the pricing looks reasonable (I’m only using 2-4TB right now, but I expect that to double or triple in the next couple years).
Anyway, this is a somewhat temporary situation. Quiet gives me options. If it’s too loud, I can keep it on my desktop. I’m more looking for lower power (currently use 50W-ish idle for whole system) and smaller form factor (current one is a massive ATX tower).