The Somfy One / One+ is the key component of your system, like the Link for Somfy Home Alarm.
The Somfy One / One+ install process starts with the positioning advice to help you position the device in order to maximize your level of protection. (you can read the article Installing the Somfy One).
Positioning advice
The Somfy One / One+ should be positioned in a location where there is optimal communication with the WiFi network and with all installed devices (if you have some) :
You can read the article about motion detection to adjust you motion settings with sensitivity levels and zoning : How to configure motion detection?