I like that Unirack system… looks like it does a good job of distributing the load across a wider footprint.
What is the purpose of bending the edges of what appears to be a lead jack type foot in the shape of turnback metal? Under the tile pieces, I can see the importance… on the reveal seems somewhat useless.
If it’s a shingle roof (either 3T or Comp) then there’s not anywhere near as much height or gap between the roof deck & the topmost portion of the shingle (in their pic, the top of the tile). I guess in retrospect this doesn’t make much difference… or does it?
I have done TWO houses with solar setups; one for water panels, the other for photovoltaic. In both cases, it was someone’s else responsibility to waterproof the pen points (as well as do the mounting to begin with).
Typically, they (again, not me) use an L or C channel shaped shaped bracket that gets foot bolted right through the roof shingles & roof deck.
BTW, that should have read 3/8" in the post ^ & not 3.8"…