8 Inch Poe Android Tablet Pc Wall Mount (rockchip3288, 2gb Ddr3, 16gb Nand Flash,android8.1, Quad Core, Hdmi Out, Bluetooth) - Desktops & Aio - AliExpress
Best Tablets With HDMI Output in 2022 [HDMI Compatible]
Amazon.com: 13.3 Inch 4K Upgrade Android 10.0 Multifunction Car TV Headrest Monitor Tablet Touch Screen Support 1080P Headset WiFi/Bluetooth/USB/SD/HDMI in+Out/FM/Mirror Link Video Player (2G ram 16G ROM (1PC)) : Electronics
Top Tablets with HDMI Output and Input
HDMI->USB tablet as monitor or HDMI capture on Pi - Raspberry Pi Forums