How to set them up when mutiple sets of Cosmo C1 are used at the same place?

Note: Cosmo C1 has 8 channels, it supports up to 4 sets of devices that can be used at the same place. Please open Cosmo C1 one by one, and set the device's work mode to AUTO, then it will select a clean channel automatically when there exists interference.

•      Select the AUTO mode
•      Place the RX 1.7m above the ground
•      Keep the RX at least 0.5m away from each other