Here is a system that lets you turn your tablet into a teleprompter. The ikan PT-ELITE-V2 supports iPad, Android, and Windows tablets for teleprompting. It features 70/30 glass for improved clarity and sharpness. The EV3 Quickrelease Baseplate lets you attach or remove your camera easily. It can adjust to different camera sizes.
The PT Elite Version 2 supports tablets ranging from 5×7.5 inches to 8×10.5 inches. The Pro version supports larger tablets like the iPad Pro. The bad news? These are not particularly cheap.