Does the arrival dlc in mass effect 2 take place after the game or whenever you want to?

because i know it supost to do something with the upcoming mass effect 3Does the arrival dlc in mass effect 2 take place after the game or whenever you want to?
you can play anytime after the horizon mission, but it seems to me it makes more sense if you play it after the suicide missionDoes the arrival dlc in mass effect 2 take place after the game or whenever you want to?
You can start it at any point after Horizon, but I think there are a few extra lines of dialogue if you play it after you complete the main game.

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