This POI is a fake.
This Stolpersteine existing at a another locating in this town.
Here is real location:
As proof, here is the article about how the stones were laid at that time
with the indication of the street.
Links:
Erinnerungsorte (erinnert-euch.de)
Saarlouis, Demnig, Stolperstein, Cahn,… | Institut für aktuelle Kunst (institut-aktuelle-kunst.de)