Stolpersteine in Polish Silesia


Has anyone had experience of installing Stolpersteine in Polish Silesia ?
My paternal grandparents, Adolf and Frieda (nee MASUR) STEIN lived in a small town, Kanth, now Katy Wroclawski, along the railway line , 12 miles SW of Breslau, now called Wroclaw.  They were murdered in April 1942 in Izbica ghetto, presumably on the way to a conentration camp. 

Which level of local council one should approach, the municipality or the regional ?  

There were 4 Jewish families in this small  town.  I have contact details for the granddaughter in London of Dr And Mrs HEIDENFELD.  There were two other families, the JUNGMANNS  and a family who owned a shoe shop.  Any suggestions for searching for their families?  
Margaret Levin
London N 3

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