Thank you for all the responses!
I understand the opinions towards Behringer. But financially I have the choice of either get Behringer for my first setup or no modular at all.
Behringer was my gateway drug into synths in the first place, now it's my gateway drug into modular.
If I had the luxury I'd get a completely different setup, but that would cost loads more. The Mordax DATA already was a very hurtful experience for my wallet.
But recently I learned about self-build kits which are cheaper, so I'm looking into that (Dreadbox for example).
Now that I have this setup to start with, I can save money to expand this system with better quality and brand modules.
About the layout: I'm still working on it, I'm restricted with the depth of the case on the bottom row and I need to get a feeling on what works best.