Tangential public service announcement: Your forearms should not be digging into the edge of the laptop. If they are, you are positioning your hands and wrists in an uncomfortable and inefficient way which has a good chance of leading to RSI. Irrespective of the smoothness of the laptop corners, don’t do this!
Ideally you shouldn‘t be putting any significant pressure on any surface with your forearms, palms, or wrists while actively typing. You want your hands “floating” with the fingertips resting very lightly on the key tops. But even if you must rest your hands or arms on something, please keep your wrists as straight as possible, and especially avoid wrist flexion or extension.
The surface of your laptop should be more-or-less parallel with the plane of your forearms, with the keyboard kept close to your torso so that your shoulders can remain relaxed with your upper arms hanging down at your sides. (This reduces the torque your arms put on your shoulder, allowing you to comfortably support your arms without any need for external props.)
If you have a tall desk and a low chair, and can’t change furniture, the way to work around the poor furniture design is to either (a) move the laptop to a low tray or directly onto your lap, or (b) prop the back side of the laptop up so that the base of the laptop is tilted toward you, with the keyboard parallel to your forearms. Keep the laptop (or whatever other keyboard) near the edge of the desk.