I don't know man... I too had no problems viewing the screen from the third row and the kids will be in boosters/car seats anyhow. Plus, I can play a movie on my phone, stuck on the dash of my current car, and every child from the second to the third row is glued to it. They do not have the same desires and needs as you and I do. Appreciate your willingness to do this though but I am afraid your option might be a cheap Kindle Fire HDX ($79 for kids version).
2016 Kia Sedona SX w/ Tech or 2017 Chrysler Pacifica Touring L Plus with Tow and Tech? That is my conundrum.