Yes, you can buy a vehicle from the Mobile de website if you are outside Germany. However, make the contract with a trustful dealer car that can make all the paperwork for you, or ask a friend to go check it for you before buying it if he or she is in Germany. Many car dealers offer this service on the website; it is up to you to trust them, they will charge you an extra fee for this kind of service. Remember that he must register and make all the paperwork for you so you can get your car at your location after you make the purchase, so it is a lot of work.