I was thinking of installing my new VDO Dayton MS 5500 Navigation unit in the center A/C vent area (since there's no other slot available for it). Is it possible?

I really don't care if I can't get air from the center vent as long as it is possible to remove the vent and replace it with the nav unit. My monitor will be from Audiovox LCMR6CT replacement rear view mirror with temp and compass.