How should I place window sensors?

Hello,
I would like to install windows sensors on a window like this.
How would you do it?
I have 3 windows like this.
Thank you

I have a few big double sliders like that as well. What I did was to use small bar magnets attached to the outer sider’s window frame, with the Ring contact sensor in the inner slider’s frame:

This way, no matter which slider moves, the magnet and contact sensor will move apart from each other and will trigger the “open” alert.