Hey, Laureen. I've not dealt with an EIN, so I don't know much about how the works once you apply.
However, if you experience a delay at all in getting an EIN, try registering using 000-00-0000 for the SS#. You can always go back into your profile with the companies that you actually shop for and "update" it to show your correct information after you have done a shop for them and gotten paid. That way, you know if they're a "good" company to work with.
By doing that, you keep your actual EIN or SS# away from employees at the companies that you register with, but don't actually shop for.