I'm fairly certain that they do not manufacture different floorpans for different seating configurations and it should be bolt-on. BUT, you also need the underseat console/storage for the middle seat, it's an integrated solution. You would obviously need to remove the standard center console.
The 2-seater has a lighter divider, the 3-seater's divider is much sturdier as it has the middle seat belt's upper attachment in the middle.