We are adding a second Tesla to the family. Right now we have 2 drivers on one car. With the second Tesla due in a few months, we would like to both have access to both cars on the app. Do you need to have 2 logins - one for the primary driver on each car and then placing the other person as additional drivers and vice versa? Also, the e-mail address used by the wife as an added driver is different than on her order and account she established to the purchase. Can you change the e-mails to line up on both apps? Confusing...