Are you speaking from experience? I've found the TN process really confusing for an intern, and if you have any experience with the application process, I'd love to hear about it.
TNs aren't for internships. J1s are.
Yes. Get the company's lawyer can fill out the paperwork for you and you show up at the airport with the paperwork and receive a visa. You can't apply in general for a TN, it is company specific.