If in doubt, ask. That applies to this, and anything else. Don't worry about HOW you ask either. Don't get hung up on radio language and requesting this or that; just ask in plain English. I've said at various times: "Where would you like me to go?"; "Where should I park?"; "Er...not familiar with that aircraft type you want me to park behind; please could you direct me"; "I'm sorry; I don't quite follow that", and all sorts of other variations. It's easy to get so hung up on correct radio usage that you forget that it's primarily about communication, and that ATCOs, FISOs, and A/G operators are there to help you.