The current version of the Loona software is not yet supporting for use on the desktop, so please do not place Loona on the desk, which will cause Loona to fall off.
Meanwhile, please keep Loona away from the downward stairs to avoid Loona falling from that.
Loona's sensor can do edge detection, but it will take some time to tune and optimize the sensor's performance so that Loona can run in more scenarios. (Will be updated to all users via OTA)