Hi @Ivan_Lau,
Thank you for your post. Unfortunately, the diverse range of upstream services required for Roon and ARC prevent us from sharing any evergreened list - there are too many addresses that would require constant updating on both our parts.
That said, many proxy services do allow for ARC to function out-of-the-box by offering different NAT traversal mechanisms, etc. Please see this thread for a little more information: Is Roon banned in China?