Reverse tilt mounts?

What solar panel racking vendors provide guidance and support for reverse tilt mounts?
There are a lot of installers who would like to offer those, but lack the engineering expertise to design them from whole cloth; support from the vendor would help those installers do it right.

Unirac specifically advises against it with their products:
http://unirac.com/wp-content/uploads/bsk-pdf-manager/88_SM_REVERSE_TILT_APPLICABILITY.PDF

Spice Solar has one drawing with reverse tilt:
http://www.spicesolar.com/wp-content/uploads/2015/04/Spice-REVERSE-TILT-ELEV.pdf

The Australian company Clenergy has the most detailed info I've found so far.
http://clenergy.com/Products/Mounting-Systems-PV-ezRack/Solar-Roof
has an adjustable tilt leg installation guide with a table showing base rail support spacing for reverse tilt based on roof slope, wind zone, and building height:
http://clenergy.com/getmedia/1e86aec5-4ede-4f01-a230-89df39d49ec0/Installation-Guide_PV-ezRack_SolarRoof_Adjustable-Tilt-Legs_AU_V3-2.pdf.aspx

I'd love it if anyone could chime in with info about other vendors that support reverse tilt.

I ask because an installer did this: https://goo.gl/photos/DJHBdP7kUMTBhEyQ6
The flush-mounted panels are fine, but the reverse tilt looks wobbly, and I have no evidence they engineered it for wind loads.

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