You could group the dimmers f.i. using the Device Capabilities app.
When any dimmer is changed, they all follow and get the same value, when the ‘Calculation’ is set to “Mean”
Note: the “BLL Expression” is cut-off in the screeny, it is Math.round($value*100)
When you want a Lead/Follow setup, use the main dimmer to set the dim value of the grouped dimmers
