Hi Jan,
It should work properly, just an additional recommendation would be to avoid air gaps between the sensing plate and the dielectric (steel cover), in fact, if the sensing plate and the steel cover are touching this will increase the sensing area which means that the sensitivity would increase.
Here are some application notes that could be useful for this application:
AN10832 “PCF8883 and PCA8886 - capacitive proximity switch with auto-calibration” http://cache.nxp.com/documents/application_note/AN10832.pdf
AN11155 “General design guidelines for the NXP capacitive sensors” http://cache.nxp.com/documents/application_note/AN11155.pdf
Have a great day,
Jose
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