My boy pointed me to this one the other day, it’s like completely open. Does not care where you get the book from and can do books and comics ( even though this particular model has a smaller screen)

Pocketbook Touch Lux 5 | E-Book Reader | Glare-Free & Eye-Friendly E-Ink Technology | 6ʺ Touchscreen with HD Resolution | Wi-Fi | Adjustable SMARTlight | Micro-SD Slot | E-Reader in Ink Black https://a.co/d/gXY8b2e