Edit…
Setting MR to internal and Apollo to ADAT actually works.
Even if I use only Apollo and MR is off. I don’t know from where it gets the clock but it works…
Another interesting thing here is that when I set MR clock to internal, and it connects to Apollo, so I can hear the sound, I can change the clock of MR to ADAT and it works. But after restarting it does not work, no sound.