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2010 CR-V Cargo Tray + Cargo Shelf
The Cargo Tray is an option -- http://automobiles.honda.com/cr-v/accessory-detail.aspx?Accessory=CRV0010043
The Dual Deck Cargo Shelf "hides in the floor when you don't need it."
Can one stow the Shelf in the floor if the Tray is in place? If so, does the Shelf go on top of or underneath the Tray (presumably underneath)? If not, is there any point in having both the Shelf and the Tray?