What about this QNAP for a direct-attached storage solution (it also works standalone without a NAS, which is how I’d be using it): https://www.bhphotovideo.com/c/product/1454549-REG/qnap_tr_004_us_qnap_tr_004_4_bay_usb.html
with these drives: https://www.newegg.com/seagate-exos-x20-st20000nm007d-20tb/p/22-185-011?Item=22-185-011&cm_sp=product-_-from-price-options (the only good NAS HDD BlackFriday deal I've seen so far).
Overkill on storage space for sure, but at least somewhat future-proof..? What do you think?