I bought the sensor and it is NOT compatible with Somfy Tahoma!!!!
I have a Z-Wave stick on the Tahoma.
1 sensor is recognised as 8 products when learning on the PC, and as 2 products in the app. It is not possible to configure the Flood Sensor+ as a sensor in the Tahoma. I have written to Somfy support. They confirmed that the product is NOT compatible.

I don't know Somfy Tahoma, I use a Raspi with RaZberry from https://z-wave.me/ based on Z-Wave.

The Fibaro Flod Sensor supports AppleHomeKit and Z-Wave.

I had a quick look at Somfy Tahoma, which is compatible with Alexa, hue, IFTTT and Sonos.
Apparently, a corresponding USB module is needed to connect Z-Wave devices https://www.somfy-onlineshop.ch/de...

Good luck! (not ironic!)