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My front seats have a flat metal support bar underneath the back of them exactly the same width and length as the led strip light so just used the 3m sticky backing tape they came with and they fit perfectly. I tapped into the drivers side wires behind the B pillar/seat belt panel and ran them under the seat runners and carpet so they came up next to the factory seat wiring which is away from the runners and clear when you slide backwards/forwards. Did the same on the passenger side seat running the wireMine look a little purple-y as well, much better at night time.
What did you end up mounting your rear ones to? and where did you run the wiring?
I was going to mount mine to the bottom of the seats, but was a little worried about the wiring when sliding the seats forwards and backwards.