Choose the real working set
Choose an existing tray suitable for contact with the surface. Measure its outside footprint and compare it with the area you want to reserve.
Reserve the actual footprint
Place it empty beside the actual working set. Try the ordinary task and notice whether the boundary leaves enough usable space around the keyboard or paper.
Try the ordinary sequence
Move the empty tray once if needed and repeat. This comparison concerns its footprint; it does not verify load capacity, surface compatibility, or suitability for equipment support.
Keep the useful boundary
Remove the tray if the boundary alone answered the question. The final arrangement may use the same open area without keeping a container there permanently.
A couple of useful questions
Do I need to buy the objects in the picture?
No. The AI image is an editorial concept, not a product listing. Begin with your own suitable objects and actual dimensions.
Is this a tested equipment or health recommendation?
No. These are visual planning notes, not product tests or prescribed ergonomic settings. Use the actual maker instructions and your own requirements for equipment decisions.
