And which of these punctuation marks is used to mark something as a transliteration? The middle dot • serves as spacing in multi-part names, but that doesn't tell you where the transliteration begins or ends.

Very often 《…》/ <…> / 「…」are used to delimit transliterated proper names.

I've only seen angle brackets used to indicate titles of books, movies, etc., and regardless of whether the name is transliterated or not. The corner bracket quotation marks are more typical of Traditional Chinese typography, which I don't see as often, since I mostly read writing by mainlanders.