Samsung UE46D User Manual page 26

Preparations before installing a videowall
Align the sets using the Holder-Align and Holder-Half Align.
Installing a videowall
Attach the Holder-Align at the spot where the corners of the four products meet in the middle of the videowall (make sure the word TOP is shown at the top).
• Adjust the Holder-Align so that the bezels of the products align.
Attach the Holder-Half Align at the spot where the corners of the two products meet on the side of the videowall.
― The following images are for reference only. Real-life situations may differ from what is shown in the images.