From the match contract that you agreed by signing up for the match:
If an applicant wishes to accept a position at a program that is not participating in the Match, or decides not to participate in the Match for any other reason, then the applicant must submit a withdrawal from the Match and must not submit a Rank Order List for the Match.
So, you are not only screwing over your colleagues by trying to reserve 2 seats, you also risk losing both of those seats and becoming ineligible to ever participate in the match again.