If you haven’t already bought the dimmers yet, I highly recommend considering the new Lutron Aurora dimmer that works with the Hue Bridge. This fits right over the top of a dumb toggle Switch, Is very intuitive, and looks like a regular dimmer switch. We’ve had one for a few weeks and just ordered two more.
Community discussion
Lutron Aurora dimmer for Hue lights (Z3-1BRL)
Also just be aware that whether you are using the Hue dimmer switch or the lutron dimmer switch, You will be limited to around 10 “accessories” per hue bridge. And multiple bridges can get complicated with a SmartThings integration. 