So, are there any times we don't recommend saving your top tier? Yes! If you will be moving during your first year of marriage, it's best to keep it someplace else or not save it. If the cake thaws and refreezes during the move, which it will, it will taste freezer burnt. Or, if you don't have proper storage, then it's best to serve the cake at the wedding.
Other than that, you should be good to go! Make sure you get plenty of pictures as it's a fun memory of your wedding celebration!