KJcschers..if you're asking me, I have a Focus. It has 18" wheels. I am leery of putting boards in the pan. The pan helps contain the tires and also acts as a tire stop as you're loading. It would be all too easy to overshoot the pan with the boards in place. That would result in ripping part of the bottom of the car off, including the intercooler, etc. If you're considering a NON-ST Fiesta, I would strongly recommend you flat-four tow it.
Fran, Mary & Zoey (silver Cocker)
2006 Itasca Sunrise 35A, 2005 W-22, Allison 1000 5 speed
'13 Ford Focus ST or '10 Prius on Master Tow Dolly 80THD-SB or '00 Jeep Cherokee 4-down