Responses in order: I'm not sure I understand your question. There must be a US company acting as the O-1 petitioner/employer (except under very limited circum

Responses in order: I'm not sure I understand your question. There must be a US company acting as the O-1 petitioner/employer (except under very limited circumstances) and many of our clients use Stripe and Clerky among others to set up their company. This will depend on the founder's country of citizenship and qualifications but the default options (not including the country-specific options) are the E-1/E-2, L-1, and O-1 visas.