DIY has been hit/miss specifically with the 2019 16-in macbook pro, it HATES them. The older models were fine and the 2021 m1 seems good so far. I had so many crashes with various combinations of drives/enclosures. Even with Samsung T5s a few times on my 2019 16in
For enclosures:
For drives, these are all solid options from respected brands.
SK hynix Gold P31
WD_BLACK SN750
Samsung 980 PRO