After looking into similar situation, I ended up buying a Blue Sound Vault. NAS’s are great but you must do all the loading via a PC, meta file editing, organising etc. There are programs that do this ok but still requires some effort and time. The Node is dead simple stuff a CD into it, and it does it all is self, it can also be backed up to a hard drive or NAS. Can read off a NAS or hard drive as well. It’s also a good streamer if you use the digital out to your DAC. I found it hard to tell the difference to my other streamer at a significant cost increase. That streamer is now sold off. The Vault is a handy devise that organises and makes your digital music easy to use through the app. The vault can be set to store using FALC/WAVE etc. so basically CD quality if burning a CD for example. I do not know if it can handle hi rez recordings though as I don’t have any SACD’s. Probably though.
There are more expensive options that do the same, but I have to say the Blue OS is excellent (better by far then the Aurender app). The vault worked flawlessly for adding my 300+ CD’s (with more then half the space still avail). I used FLAC as its lossless and slightly less space needed then WAVE (Native red book CD). But you can pick either option for storage.