Abus FUMK50020 Installation Instructions Manual page 23

 For window/door frames with a rabbet depth of less than 19 mm and sufficient
space, we recommend installing the wireless opening detector on the
window/door frame.
(Reverse installation is also possible in this instance, however.)
 For window/door frames with a rabbet depth of more than 19 mm, the wireless
opening detector must be installed on the leaf of the window/door using the 7 mm
magnet bracket plate.
Prior to installation, always check that the distance between the
detector and the magnet is sufficiently short that the magnet can be
reliably detected by the wireless opening detector.
To test the detector's triggering function, we recommend pre-assembling the
magnetic bracket and detector base temporarily, using the attached adhesive film
but not the screws.
Once you have checked this, we recommend installing the magnet bracket and
detector base using the screws to secure it in place permanently (you do not need to
pre drill the plastic).
You should always check the rabbet depth of the leaf before making any screw
connections and avoid the screws emerging on the opposite side. (If necessary,
screws may be shortened.)
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