What is important with regard to the official registration plates?

Your answer is fully correct. According to German traffic rules, registration plates must be securely fastened at the designated mounting points to prevent them from falling off or becoming loose. They must always be easily readable to allow authorities and other road users to identify the vehicle without difficulty. Additionally, the rear registration plate must be illuminated at night or in darkness, ensuring it is visible to other drivers and enforcement personnel. These requirements are important for vehicle identification, legal compliance, and road safety.