John,
Been in the same place. Same questions.
After looking at the costs and deciding the Siamese cable was too expensive until more cable companies jump on the bandwagon and bring the price down.
Tape is definitely cheep but will become a mess.
I fell back to cable ties. Won't fall off, won't get messy, works for me...
A good 12/3 extension cable with a heavy duty mic cord. We made them up in 25', 50' and 100' lines.
We also made some up with orange molded cords to keep electrical inspectors happy.
Bob Cap
Advanced Audio Inc.
Gilbert, MN 55741