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Can i stick the sensor to the wall or somewhere, i think the sensor better has some kind of suction

Unless they're using some kind of new technology to detect water it seems like the sensor needs to be where the unwanted water will be. And that's on the floor.

Our homes are different from what people build at the US, but at least here, leaking water is normally located at the walls. You'll have plenty of evidence of a leakage (like destroyed painting and bad smell) much before it reaches the floor.

Plus the huge dark stain on the ceiling/wall...

This sensor doesn't seem to do any extraordinary detection like that. It's an ordinary RH/Temp/H20 contact sensor.

Now if the sensor could watch the walls for far-infrared discoloration to show unseen leaks that would be useful in your part of the world, but that's going to be a ways off.

http://smokedamagemichigan.com/water_damage.htm

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