So I didn't order the HPWC but did get a 2nd UMC and the cable holder/bracket. Worked fine along with some help from industrial strength velcro! Pretty strong stable stuff. Bracket is in dry wall expanders of course.
Now just a week or so to go...
[WIKI]View attachment 83264[/WIKI]
FWIW Travwill this does not look like a mess to me at all. In fact, much more organized than, say, mounting HPWC on trellis with exposed flexible conduit.