We had provision on the back wall already for cables and I wasn't sure exactly how to ceiling mount with our suspended ceiling system. I've heard anecdotally that a ceiling mount is more like to transfer vibrations through the floor, but I have no idea if that part is true.
Mostly it was about our ceiling system. Didn't do any research into how hard or easy it is to mount with a ceiling like ours, but I can't imagine it being easy. Maybe I'm wrong.
Turns out this arm is pretty sweet. We had to drill our own holes in the mounting plate, but beyond that it's been great. The arm can extend a bunch and can angle up or down 5 degrees. The mounting plate can slide side to side by an inch or so each way. It has 3 knobs for adjusting the angle on all 3 planes. Once I moved it into the proper mounting position on the wall it was very easy to get it pretty much perfectly aligned.
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