Are Stetzer filters useful with transformers in Europe?

I am moving to Europe (Italy) and I have a lot of Stetzer filters. I am considering whether selling them or bringing them with me. I will be using a couple transformers for appliances that I bring from the US. I was wondering if there is any use of the Stetzer filters in transformers. I see the sticker says 60 Hz so I assume they cannot be used with only the adapters, correct?
Thank you so much in advance for any response!