I use the Moshi iVisor and love it. It's incredibly easy to install too.
Amazon.com: Moshi iVisor AG Screen Protector Compatible with iPad Air 4 (10.9" 2020)/iPad Pro 11" (2020/2018), Bubble-free, Easy Installation, Anti-Glare, Washable & Reusable, Edge-to-edge, Supports iPad Pencil: Electronics