Luckily I replaced an old bracket so I had two top holes otherwise it's definitely a two person job so I'll give it a 3 for installation. It's very solid. I decided to add two extra screws to the existing holes in the panel for added security. It holds the 55-inch Roku TV element at a serious angle and is still level thanks to the included mini bubble level, thanks for adding that btw. Overall it's five stars. I feel like a lot of the negative one star reviews are from people who either didn't know what they were doing or were just on their own which makes things a lot harder.
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