As Brymo said, Call them up.
I called Apple and was told I could reserve one and my wife could reserve one. Not a problem. Coming from Verizon however, to sign up for a Family Plan, we need to go to an AT&T Store or an Apple Store on the 24th.
We will then be signed up on the spot. I called both Apple and the store closest to me. Both verified that would be the easiest, quickest, and best way.