Very easy to assemble and even just screw to the monitor and then attach to the bracket, DIY. I've managed to mount my 49-inch Samsung Β£33 monitor and Predator XB241H on the top or center since my TV is at the top. Whatever it was BUT it couldn't hold the 49 inch monitor in place. It will face down but I was able to screw in two screws to prevent this and lock it in place. It's hard to see in the photo, but the arrow shows where I screw the screw in.
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