Some useful links within:
https://www.reddit.com/r/Amd/comments/cb8tyr/asus_pro_ws_x57...
ASUS Pro WS X570-Ace seems like the top dog here.
https://www.anandtech.com/show/14161/the-amd-x570-motherboar...
The conclusion doesn't point out ECC-compatible boards, but the comments mention the same Asus.