After having got extensive and kind advice on location, I was handed over 2 sensors by Karine from CELL.lu. I will install them in the next hours in my small urban garden in Luxembourg City. That hillside garden also has many hours of shadow per day. I am curious to see the 1st values recorded.
There's a drought too in Luxembourg, this official communique from today gives additional information: https://gouvernement.lu/fr/actualites/toutes_actualites/communiques/2018/07-juillet/30-secheresse-agriculture-service-meteorologique.html
I will keep you posted on interesting stuff.