....both with slave doser pumps - able to both be connected to 1 Profilux 4 at the same time?

I have multiple tanks - on different floors of the house so I need 2 KH directors (already have both in hand) - one has been running just fine. I plugged the second one with it's slave 4 head doser pump in - but it seems like the Profilux 4 is sending the exact same commands to both at the same time.

Please tell me there is not a 1 KH director limit to a profilux 4.