could say visit the "televes" for signal distribution amps, but still cannot figure how each receiver will work independently.
the diseqc is on single out puts and cannot work out.
you just have to sort out the frequencies at a point and re-distribute the signals in rf form. this is normally possible only for single providers with several channels where cards are used for descrambling, but freqs and transpoders plus polarity is same. but your case might even have more than ten transponders on different frequencies and polarities.
maybe there is an easier way to work it out, where all the frequencies are already on and the receivers just have to tune for what is needed from the distribution amp.