Here are a few pics of the aluminum channel installed.
I used plastic tubing, attached where the wall meet the ceiling, to conceal the feeder wires.
Then I snaked 14 ga. wire through the the tube which I will tie unto a terminal stripe to reduce to 16 ga. that I'll solder to the LED tape.
Shot of the 90 degree corners which will be fully illuminated.
There are 3 -LED per inch. No dead spots. The little white squares are the LED's. I'm guessing 1/8 inch square.