This is my third breed of these holders. It is the most flexible in terms of size as it fits both an iPad tablet and a phone. I mount it on a mic stand so I can read chord charts while playing in a church band. It's the best I've found so far, while others I've used in the past are limited to just one tablet size.
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
Innovative Car Tablet Headrest Holder: Adjustable Mount for iPad Pro/Air/Mini, Samsung Tablet, Fire Tablets, Phones (5"-13") - Black
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
10.5" Tablet Apple iPad Air 2019, 256 GB, Wi-Fi, iOS, silver
11 Review