I had a couple spare hard drives after upgrading my NAS so I bought a USB RAID enclosure to use them for my PS5. This is the model I bought:

https://smile.amazon.com/gp/product/B07Z5QBLKR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

It was $75. I installed 2 3TB drives in RAID 0 mode and it works great on my PS5 giving me 6TBs of storage for PS4 games and cold storage of PS5 titles.