Hola, denmo!
If there is a tie, the two people will divide the months evenly; e.g., if there is a tie for 1st & 2nd, both people will receive 9 months premium sub. Just as money would be split in a pool.
UNLESS... the two people mutually agree to a tiebreaker, such as total points, in which case one will get 1 yr and the other 6 mo. We'll know later today if that will be necessary.