Many items can be placed on the Spyder Shelf as long as the total weight of those items does not exceed 4kg or 8.8lb. The best suggestion is a Spyder sensor to monitor room lighting. Light desk items can also be placed on Spyder Shelf as long as they don’t exceed 4kg or 8.8lb.
The screw attachment can be used for small items that have a ¼ 20 thread such as a small light for video calls, external microphone or even a webcam.
Please also check the maximum load capability of your monitor.