Where are you? Are you required to have a front plate? If not, then you will need a plate frame, you can usually get them from the same place that you get the actual plate. You do not need to get the plate registered or anything crazy like that.
If you are required to "display" a front plate, it will depend on the police in your area. If they care, and you don't display the front plate, you may get a ticket. Of course there are many ways to display your front plate, but the usual spot is preferred. Everything else is kinda frowned upon, to a certain extent.
'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!) My BMW Blog