I have looked at the data sheet
for the ZV210N don't know if this is the same switch, but it says it has a 9 volt battery inside?
It states min 40w max 300w and to get 40 watt LED is going to be a lot of light, and it does have some features like dusk to dawn and adjustable light level control for dusk switching to compensate for differing light levels within a building. And at £33.54 it is not a cheap device.
It seems not suitable for 3 x 2.5 watt LED bulbs, you don't say what type, I looked at these GU10 bulbs
slightly larger at 4.5 watt, and at £8.48 each not much under the price for the switch, they can be set up with dusk to dawn with an off period in centre, if you have internet available, but clearly not a direct replacement.
There was that little in the price of RGB and white only may as well have RGB but we have no idea where your bulbs are, showing a red light may not be appropriate?
However my point is we need to reconsider how we do things today, I have replaced my outdoor quartz halogen flood lamps for carriage lamps with smart bulbs instead of PIR's to give a better spread of light and be able to switch on before I leave the car.
And with just 2.5 watt is it worth switching off? in days gone by the indicator light was that big, is it really worth switching on and off?
The problem is our property was designed in the days of tungsten, and so we are trying to adapt to LED, and this does not always work, I have electronic switches which work with LED, but need around 10 watt load to work well, so now only 2 or the original 5 still in use, I liked them as they worked with a remote control, no need for the phone, but today we seem to be moving to voice commands.
Not sure I like voice commands, last night looked out to realise outside lights on, seems earlier in the evening wife asked for one light on, and Nest switched on more than asked for, but at 18 watt that was not really a big problem.