How to best use leak detector under sinks?

For using a leak detector under a sink, what is the best way to implement them? Just place one at the bottom of the cabinet below the water lines and drain? Does the water have to raise to a certain point before it triggers, or will just a few drops touching the sensor do the trick?

the sensors need to be bridged with water for it to alert. Does not take a lot of water. I have mine under the faucets. I have seen that some had a shallow pan they put leak sensors in which would span the cabinet and ensure it collects the water.

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I just sat mine directly under the trap which happens to be the lowest and center point under the cabinet where the water usually goes for me… or down the intake lines, down the trap, down the garbage disposal, then collects somewhere.