Set your table, drop in items at real dimensions, then drag them around in 3D to plan the layout.
Table
Add an item
Items on table
Selected
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View & scene
Drag an item to move it, or drag the amber ring around a selected item to rotate it. Drag empty space to orbit, scroll to zoom. To slide the view, tap Pan (top-right), or hold Shift / right-drag, or use two fingers. Keys: R rotate, Del remove, arrows nudge.