Mounting sensors

Hope this is the right place. This should be VERY east.Door sensors. How much offset can these sensors tolerate? Not distance apart, but offset. Where I will be mounting them, looks like I'll have a 1/4" offset.Mounting door sensors and glass break sensors. How long will this adhesiveness last? 1 year? 10? If I remove the device, will it also remove paint? Can I mount a door sensor by adhesive and, if it doesn't work, remove it and remount?