Install this accessory to add AV components or video conferencing equipment with your display. This shelf is compatible with carts, stands, ceiling, and walls and has an easy installation. Dimensions and specifications dependent on application type: wall, ceiling, freestanding.Install this accessory to add AV components or video conferencing equipment with your display. This shelf is compatible with carts, stands, ceiling, and walls and has an easy installation. Dimensions and specifications dependent on application type: wall, ceiling, freestanding.