The memorial for Gnesin, scroll down to see the pictures:
https://www.aerosteles.net/stelefr-cornebarrieu-b17
Location on Google Maps in street view.
If you look down the path to the right of the garage (on the left) you can see the memorial stone for Gnesin at the end of the path.
https://www.google.com/maps/@43.6437...8192?entry=ttu