The instructions supplied show that 4 anchors are used but only 3. The frame is connected to the ground wire. The "US" mounting plate didn't fit and I could only get one screw in so I was glad I had to use 3 anchors. Don't forget to check the alignment of the lights. I thought they were opaque on both sides, but they aren't. One side is mirrored so even though they rotate individually I don't trust the durability and ended up flipping them over to direct the light onto the double sinks instead of bouncing off the ceiling. In any case, I checked it out and I was sure that I would get my wife's opinion. :-) She also preferred downward light. As for durability, time will tell. The replaced LED light was only 5 years old and from a different brand.
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