We had a DVD player in our minivan but it broke, not to mention we had problems with it (who even has a DVD) and couldn't watch Netflix on it (although it had an HDMI port, there were copy protection circuits preventing us from playing Netflix!). Currently the best option is to install an iPad with shows/movies preinstalled. The kids love it and it's very stable even when the kids play with it.
π Universal Car Headrest Tablet Mount Holder - Compatible with iPad Pro 12.9/11, Phones/Tablets/Switch 4.7"-12.9" - Adjustable Headrest Posts Width 5.2in-5.7in - Sleek Black Design
10 Review
Flexible Arm Tablet Holder, Lamicall Gooseneck Tablet Stand: Clip Mount for iPad Mini Pro Air, Switch, Galaxy Tabs, and More 4.7-10.5" Devices - Gray
11 Review
π± 13-inch Gooseneck Tablet Car Mount Holder β Extended Arm Suction Cup Mount for 7-11 inch Tablets, Cell Phone Holder for SUV, Truck, Vehicle, Lift, Uber β Windshield Window Mount by APPS2Car β 2-in-1 iPad Compatible
9 Review
Innovative Car Tablet Headrest Holder: Adjustable Mount for iPad Pro/Air/Mini, Samsung Tablet, Fire Tablets, Phones (5"-13") - Black
11 Review
Tablet Samsung Nexus 10 GT-P8110
28 Review
Logitech K380 Keyboard Sleeve - Felt Travel Bag Case, Wireless Keyboard Sleeve for Logitech K380 Bluetooth Multi-Device Keyboard (Felt- Deep Grey)
30 Review
10.1" Tablet HUAWEI MediaPad T5 10 (2018), 3/32 GB, Wi-Fi + Cellular, Android 8.0, black
49 Review
10.1" Tablet HUAWEI MatePad T 10s (2020), 4/128 GB, Wi-Fi, deep blue
61 Review