Business address in Montreal for a French SASU or SARL: is it possible without a Canadian subsidiary?

Yes, a French SASU, SARL, or SAS can take an Ancre address in Montreal without having incorporated a Canadian subsidiary. The address first serves as a commercial point of contact: prospecting, receiving contracts, returns from Quebec customers, mail from platforms such as Stripe or Shopify. If activity in Quebec becomes regular, registration with the REQ becomes mandatory, and the same Ancre address can then be declared as the establishment. The Kbis extract and the director's ID are enough to open the box remotely.