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Shield hatch could be placed on the board, to minimize ground coupling of sensors. They need not be connected to the overlay.
Guard electrode could be placed on the board and you need to include multiple springs on the board, connected to the overlay.
Please make sure that only a water puddle would trigger the guard sensor and not a touch on CapSense sensors.
You could also employ a firmware technique to reject touches, if multiple sensors are activated, instead of using a guard sensor.
(If your application does not require multiple sensor touch at the same time)
NOTE: Cp should be within datasheet limits. You can design a prototype and check if it meets your application requirements and then, go on with production.
In general, you can refer to PSoC 4 CapSense design
I hope this helps.
Thanks Shanmathi, I will do as you have suggested