I just asked my DH.. he said they happened to have discussed this in his shiur last week. he said al pi Kabbalah they should be worn behind the ears. he said one Chossid [in his shiur] said he does take his peyos out before S’E (my husband said he’s “seen this for years already”); my DH doesn’t know the reason why– minhag.
sorry, that’s all I could get 😉