Spider, I'm enclosing a pic of how I did mine.  I will also try to explain it.  So it's a piece of 1 X 12W X 36H (you need the 12" width or the fan don't oscillate right)  So I just put the mount on the wood so that the body of the fan would be about 4-6 inches from top of wood)  Then I just drilled some holes up top and put two heavy duty zip ties and put a ratchet strap like the ones for our grow lights and just attach it to the rear support and now the fan can be moved in unison as your canopy grows. not sure if you might need a little wider piece of wood, my fan is only about 13".  I hope you can understand this.  Happy growing.