If I were you I would put the order on hold now, and not have the hold come off your order till you are ok with being matched with a car. If you let the system match you with a car, THEN put it on hold, I believe the order agreement (which you agreed to when you placed the order) says something like you have 30 days to accept the car.
If you cant take delivery, contact tesla and put the order on hold till you can, then you wont have the possibility of getting matched with a vehicle then having to decline it.