It means "where do you want these chairs [placed]," as in "where do you want me to put these chairs." It's very idiomatic so I was surprised it translates directly into Spanish... unless it doesn't? I would like confirmation from a native Spanish-speaker if possible!
Hi Clare! I'm a native speaker from Spain and I can confirm that it translates directly, no catch here. ProfesorAntonnio already agreed that this can be translated word-for-word in a different thread, I think he's from Mexico.