from the fhr faq
Can I make a FINE HOTEL & RESORTS reservation for someone else?
Platinum Card® and Centurion® members may make reservations for others as long as they will be traveling with them. Please note that at least one room must be under a Platinum Card or Centurion member's name.
Can I use more than one American Express Card to make my reservation?
No. Only one American Express® Card in the Platinum Card or Centurion member's name can be used to make the reservation. However, you may request the hotel property at the time of check-in to use multiple American Express Cards for payment.
What credit cards do you accept?
This program is only offered to Platinum Card and Centurion members. All participating hotels accept only American Express Cards for reservations made under this program.