Buy an iPad and headrest mount. I move the passenger seat back far enough that my 3 yo can reach it. So she can change the movies or play games. It is secured well enough that it will not fly around (unless it is a really bad crash). Easy enough to remove it I have to spank her with it. And it is way cheaper than headrest DVD player. And you can take it with you when you sell the car or take it into the hotel when your travelling.

M