Bikelnside provides a system for 69,95 Euro plus 17,95 EUR per fork mount, which is simply clamped inside the car. It can only be used for station wagons and vans. The bikes are fixed securely at the fork and are protected against wind and thieves. This system is universally usable. For certain types of vehicles, there are also firmly anchored products.
In large vans and light trucks the Bikeinside carrier can be used without dismounting the front wheel. Get you TWO Bikeinside crossbars and roof bike rack with an "arm" for each bike (there are cheap ones in hardware stores). The Bikeinside crossbar has a pipe cross-section of 2x3cm so there fits aftermarket parts.
The Bikeinside crossbar will be placed on the floor, the roof bike racks attached to it and the bikes fixed to the roof rack mounts. Depending on vehicle size, for example a Volkswagen Multivan you can transport at least 4 bikes in the car.