With the WisGateEdge series, this is not available, but if you use WisGateConnect you can achieve this.
You can use Docker to set up two UDP Packet Forwarder/ Basics Station instances separately for each concentrator. This way you can set the same channels for both concentrators and also in the LNS you will see each concentrator as a different gateway.
With the Edge series, you will not be able to set the same channels for both concentrators. This system is commercial and such a use case is too “out of the box” for it. Whereas the more developer-oriented WisGateConnect will do the job.