Does this sound right?
I don't know if I can explain this, but when my GC's helpers did the electrical runs for backsplash outlets, they did so by:
using prewired spiral wrap electrical flex conduit
studs were notched on the perimeter edge
the spiral wrap was put into the notches
then steel straps were used to anchor the spiral wrap in place within the notches
Then it was mudded.
Does this sound OK?