Penguin, here's something to consider/check out:
I went back and looked more closely at the photo of the transformer in your original post. It looks as though, based on the positioning of the hinges on the top, the access door will be on the side of the box facing your lanai. Also, it appears as thought the box is mostly offset from being fully behind the lanai.......but not totally.
If SECO really sticks by their guns regarding the clearances they need for adequate access to the transformer (see post #4 of this thread - which shows 10 ft. minimum clearance to the pad), then they should have an issue with the placement.
Personally, I'd continue to pursue it further.
Bill