This is an alternative umbrella mount that solved my problem. My fence was too high to allow the umbrella pole to be right up against the fence post. In the picture of spcoder I also noticed he had to remove a post cap light to get his to work. Mine should allow those lights to remain in place.

You will note in my picture I have four supports. Two will do for most people. I have four to keep the umbrella aligned while I lift it up to open or close the umbrella. Extra mounts add additional strength if mounted where winds can be high.