Keyboard vs. screen height is crucial, and laptops have terrible ergonomics for extended periods. Get an external keyboard and mouse and a TALL laptop riser so

Keyboard vs. screen height is crucial, and laptops have terrible ergonomics for extended periods. Get an external keyboard and mouse and a TALL laptop riser so you can look straight ahead at your screen but type with elbows at a right angle at your sides. To sit on, consider a yoga ball? You can deflate it to transport between locations and adjust the height at each location to match the desk height by changing how much you inflate it.