Rent a car elsewhere - pay up - unless you have an extra half a day vacation to pick up and drop off. I value my time more than standing in line.
Rode from airport to rental car terminal only to be told we had to take another bus to the Fox Facility. Nothing, but lines and slow moving people. 40 people in line with 3 staff working.
I made an online reservation thinking that would expedite the pick up - 2 hours later we had our car paperwork - then off to another line to obtain the car - brother.
On drop off, one person checking in 6 cars then another line to stand in to get the final bill. Then another bus ride to the rental car return and another to the airport.
Use Firefly or someone else!