Stable at 12". But I wanted to elevate all the promised 19 inches while keeping my MBP's keyboard horizontal. It's impossible to get past an almost flat keyboard. The fold should be in the keyboard adjustment and turns the keyboard almost vertically.
15.4" Notebook Apple MacBook Pro 15 Mid 2015 2880x1800, Intel Core i7 2.2 GHz, RAM 16 GB, DDR3L, SSD 256 GB, Intel Iris Pro Graphics 5200, macOS, MJLQ2RU/A, silver
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MoKo Universal Laptop Stand Bundle - 4 Pack Anti-Slip Silicone Elevation Stand for Tablets, Laptops, and Keyboards - Gray
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Gamepad Microsoft Xbox One Controller, white
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