Mirror is most intuitive place for screen - finally found a unit @ SEMA that was a complete replacement mirror that included LED map lights and a 4" screen. Will get pricing and pics up this week. The cameras I offer on my site have not been bettered this year and fit the rear hump very well. I use a 7" in dash screen for front and rear camera display, DVD, TV and MP3/radio control as the best option to do everything in one unit but of course it costs more. Anything smaller than a 4" screen IMHO is too small for a backup display as there will not be enough data presented to make adequate corrective manuevers.