If you don't have a US tax id, most US broker-dealers will not take you as a prop trader. You have to go through sub-LLC. BTW, both genesis and hold allow you to trade equities only, not future. HongKong is too expensive to operate a prop trading firm imo. Why don't you check with your ex-prop firm and see if they allow you to trade remote. Also check swiftrade. They might have an office in Hong Kong or Macau. I think they have office in shenzhen.
Thanks. My ex-prop firm doesn't have remote trading. Swift Trade has two offices in Hong Kong, both are pretty far away from downtown (Central). My original post is to get the contact for the Hong Kong branches, as the website doesn't provide them. There is a company from Toronto willing to provide me a deal that is good enough. Meanwhile, I'm searching for more better deals.