Realistically, if the page is for another business it should be tied to the clients personal profile. The way I do it is .. I’ll get the client’s login credentials, create the page as them, add myself as an admin , and then logout and continue the rest of the work logged in as me.
This way, if the client isn’t happy with my work or if I get hit my a meteor, the client still has the work that we did for them under their control, not ours.