7 of the windows have insect screen so I will need something relatively minimal to molds after the screen but before th actual window.
Wireless shock sensors attach to the frame of the window rather than the glass. Some wired shock sensors attach to the glass.
To best assist, would you mind posting a photo of one of the windows with the screen? Are these outward opening windows?
The second issue is that one of the windows is in a shower. Is there any moisture resistant shock sensor?
This is a difficult issue. Sensors are generally not going to handle a wet environment like that. An outdoor sensor which is rated for humidity and moisture exposure which has a wired input like the PG9312 here, along with a wired simple shock sensor like this might be a solution.