When you get a chance can you send me pics of the clamps you got at HD to secure the cables to the rod? Kit arrived yesterday. Well made although instructions are terrible.I can’t think of a reason not to use three. I didn’t give it much thought, just used two because that’s what ATI uses to support the fixture.
I looked into the strength of derailleur cable and as far as I could tell they are rated to around 250lbs minimum, and most likely much higher.
I also looked into different support mechanisms such as these. Pretty surprising how much they can hold.
Weight Load Guidelines - Griplock Systems, LLC
At Griplock® Systems safety is our number one concern. The weight load guidelines determine the correct gripper / cable combination with safe working loads.griplocksystems.com