This suction cup from the American manufacturer Cinemilled will be an excellent starting, anchor unit for your car rig. This suction cup can support up to 16kg! (depending on surface)
The installation platform allows  attach a huge number of accessories, and additional couplings for attaching pipes (supplied separately) will further expand the range of your possibilities!
Characteristics:
Load capacity: 16 kg.
Sucker diameter: 16cm