I built my NAS using this, https://www.amazon.com/gp/product/B085ZLFSYB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1. Supports 2 full size HD, 1 SSD and 1 m.2 drive inside. Used the m.2 for the main os drive, running openmediavault and then 2 8tb drives for storage.
I built my NAS using this, https://www.amazon.com/gp/product/B085ZLFSYB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1. Supports 2 full size HD, 1 SSD and 1 m.2 drive inside. Used the m.2 for the main os drive, running openmediavault and then 2 8tb drives for storage.