What I’ve done (I was on mobile so typing was annoying):

- Disconnected the cables from the traditional lightswitch and connected them through. So basically the light would be on at all time.

- The traditional lightswitch is then connected to the Hue Wall Switch module.

- Near the lightfitting itself, I’ve placed the dimmer-module.

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This doesn’t have much to do with the way the cables are ‘forwarded’, since there’s always a black wire that should go to the lamp. The others can be looped though, because they’re only creating a circuit.
If it’s a changeover (multiple switches connected to a single light, like one at the bottom of the stairs and one at the top), you can still just make sure the light is ‘always on’ and then connect all the connected switches to a Hue Wall Module.

You can either buy smart lightbulbs or use the Zigbee dimmer. I have the dimmer attached near the light. The wall module says to the Zigbee switch ‘go on’ or ‘go off’.

I’m using everything Hue…

I bought these https://www.philips-hue.com/en-us/p/hue-philips-hue-wall-switch-module/046677571160 (US link because that’s in English, but it’s widely available in the EU).

And I’ve put something like this: https://www.into-led.com/en/eco-dim10-zigbee-led-dimmer-module-250w.html near my light. That way I can use Hue and default lights. In another room, I’ve but Hue lightbulbs, then you don’t need the last one.