Has anyone had experience of installing Stolpersteine in Poland?

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.

I would like to hear >from anyone who has applied in Poland
for permission to instal a Stolperstein - which level of
local council one should approach.

There were 4 Jewish families in this small town. I was
in contact with the daughter of Dr And Mrs Heidenfeld.
There were two others, the Jungmanns and a family who owned
a shoe shop. I would like to ask if any relatives would like
to commemorate their families.

Margaret Levin
London N 3