Coca cola amphitheater parking N5 or N7

Headed to the show Tuesday night, I want to park in N5 or N7 so I dont have to wait in N3 garage and will be heading north after the show.

Theres no option to prepurchase these lots online, only N1 or N3. Is this not an option? Do you have to pay onsite?

Any one have better info or suggestions?