How to combine two same controllers in cubase elements 10.5 in windows 10

I have two x touch extenders and one x touch. One works fine by Macke Control. However, the second extender is not supported. I also tried to connect all three devices via ethernet via rtpMIDI but cubase cannot see the rtp driver. I am asking for help on how to connect 3 controllers in this configuration and sequence:
x touch extender - with touch - x touch extender.