I am on placement with/at/in

[apfelsine]

Hello

I'd like to say that I was on placement in the Tax Office in Wroclaw. I am not sure which preposition to use. Could anybody see the following sentences if they are correct? Are all prepositions correct?

1. I was on placement at/in the Tax Office in Wroclaw.
2. I worked at/in/for/with the Tax Office in Wroclaw. I was on a six-month placement there.

thanks

[plantochat]

Hi

You would say you worked for the Tax Office.

What do you mean my placement too? Was it unpaid or work experience as part of your studies? or an internship? or were you employed there?