Also, someone asked about counter top extension. Pictures are mostly self explanatory. Spacer between bracket and shelf was is slightly tapered from front to back. Without this the shelf dropped about an 1/8" from level when in use. Wanted level smooth transition between counter and shelf. Also, magazine rack was lowered slightly to allow shelf to fit in closed (down) position.
And one additional picture related to seelevel install. Not the best images but I think you can get the general idea. Black tank photo taken before sensor added.