If you look at their faq's there areat least 2 questions relating to excess luggage. Basically saying ring and pay upfront or pay when you check in.
Can passengers utilize the Off Airport Check-In if they have multiple bags?
Yes, passengers can use the service as long as they either contact Baggage Airline Guest Services at (407) 284-1231 to pay the airline's excess luggage fees or pay them at the off airport check in facility at the time of check in.
How is Off Airport Check-In affected by airline baggage fees?
Fees vary by airline. Passengers should inquire with their specific airline as to what fees might apply. Passengers may contact Baggage Airline Guest Services at (407) 284-1231 to pay any airline fees in advance of visiting the Off Airport Check-In facility, which will have a record of the payment transaction. Baggage fees may also be paid at the off airport check in facility at the time of check in.