You are supposed to only have one car per villa and if you have both there you might prevent someone from even getting to park their one car (or in reverse if someone else does it, you might not have a space for either of your cars).
It might work out to talk to people in villa's around you and if they don't have a car they might donate their space to you...but make sure you know when they check out, so you don't steal someone else's space when they arrive.
Parking at Grandstand is what they recommend, but you could also park at Carousel if there are open spaces (lot isn't as big as Grandstand) and the drivers could carpool back to the villa. There is a path between THV and Grandstand that you could just walk back on.