Fronting a prepositional phrase in a question

Hi. Is it good style to put a prepositional phrase in front of a question? Should we put prepositional phrases at the end of the questions?

eg,

Among the three characters you saw, who is the nicest?

Among the three characers you saw, whom you can most identify with?

I think the following with a subordinate clause is a good question.

If you have found it, would you give it back to the owner right away?