I know, right? At the moment I'm trying to find some cool ideas for building a "hangout/playground" for my little guy to play on outside of his cage for an hour each day or so.
You definitely can, you just need to make sure you get the connectors so you can continue the hose.... (for example you can have the hose go straight to the corner nozzle that has a T-connector so you can connect another hose from that to the rain dome) That's how I'm going to have mine set up.
I have a mistking system with a nozzle in the top right corner that sprays toward the center of the cage. I have a feeling that my Cham also does not like the side spraying because he tends to move away from the nozzle. So I just ordered the raindome attachment last week hoping he will like that...