Well in the end one needs to be on “+” and the other on “-” side, otherwise there is no current going through, so unless there is something between - let’s say black and that gnd-pin I would assume that it does not matter if I put the capacitor like in the picture, or simply between black and white row pins. I am not a hardcore electronics crack just a guy who puts the stuff together and checks the circuit after the smoke clears out…
Maybe I am wrong, but I would also expect that NC type connection might be less sensitive to interference. If I am on 0V and get a little induced current, it might trigger the alarm but if I have the 5V on the NC switch I think some minor fluctuations do not matter, so it might not trigger the alarm. I think
in the end there is only one way to find out…