This is usually not possible because the IsoFix anchors are almost always installed during production in the factory and are attached to the chassis of the car. However, there are a number of car makes that have been offering the IsoFix system for a number of years as an “option”. In these cars, the assembly points for the anchors are already integrated into the bottom of the car body. Audi and Volvo, for example, offer this option. Talk to your car dealer for more information.