2.4 G wireless can be 4 different frequency

The wireless adaptor solution is 2.4G solution, but to make 2 wirless camera in one car? If use the same wireless adaptor,they have interference for each other, how to avoid this problem?
For this point,we have the solution right now,to make the different frequency for the 2.4G wireless camera system, that is means can wireless adaptor , channel 1,or channel 2,or channel 3 and channel 4, so the wireless adaptor cannot be inteference each other,can have a clear and clean camera picture.

Reference:12vcity