Best brokerages for foreigners (US market)

Hello, everyone!

I'm in the process of helping a good non-immigrant friend start investing on stocks.

Many speak highly of Webull.

Unfortunately, he as a foreigner without an SSN cannot create an account.

Thus, could you please recommend me the best US brokerages for non-us citizens/residents/without SSN, please?

Thanks in advance!

PS: He is fluent in English.