This video doubles as a product review and commentary on Apple’s new trackpad support for the iPad (now in iPadOS 13.4)! Brydge probably makes the best “lapable” keyboards for the iPad. The is a review of one of their latest—the Brydge 10.2 for the 7th generation iPad with a 10.2″ screen (released October 2019).
Brydge 10.2: https://www.brydge.com/products/brydge-10-2-for-ipad-7th-generation
iPad Pro (2020) reveal: https://youtu.be/09_QxCcBEyU
iPad cursor/trackpad demo: https://youtu.be/jijhJj_rNDI