There are shuttle buses going round trip between the airport and the car rental facility. You catch the shuttle bus in front of rental facility and in front of airport in the middle median.
Yes it leaves from right outside the Rental Car center.
You can also have Enterprise pick you up from home to pick up your rental free of charge, but the airport location does not offer this service only the neighborhood sites.
Yes you can.
Thanks! Your answer is awaiting moderation.