Hello Strijkkeizer and welcome
About the wiring, sounds very odd to me.
Sounds like you got plans to switch lights with smart relays/dimmers placed in your fusebox?
I’d wire any switch box with Neutral 2.5², Brown 2.5² and black 1.5² (or 2x black)
→ switches/dimmers which don’t need neutral do exist, but then you have a limited choice
I’d like to suggest to make sure your home can still be operated without Homey or without network(s). To me, smart switches / dimmers are the most versatile way, they combine manual and smart operation.
In Holland we put wires or cables in tubes.
This way you can reconfigure the wiring quite easy 
Recently a “what to do” topic was started, I’d like to recommend reading all it’s posts:
