How are Door Keepers Usually Installed?

A home owner from USA says:
Does a sliding glass door keeper simply get screwed on here to this blank receiving zone?
User submitted image of their door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Usually, the manufacturer pre-drills hole sin the side jamb of the door. You will need to line up the locking handle to the door jamb to determine the best place to mount the keeper. I would recommend marking the holes before you drill. Many keepers have elongated mounting holes so that you can more finely adjust it after its installed, to better line up with the lock.
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