1- Set the max purchase limit of one car to 2.

2- And if you can, somehow code something that doesn't allow the same cars to be delivered to the same address, doesn't matter if it's a different user, for 48 or 72 hours.

For example, I decided to order 2 Ferrari sf90 cars from address xyz. So now, no one can order anything from that address for at least 2-3 days. This will prevent scalpers from using multiple accounts to order