I originally posted this a year and a half ago, my how time flies
Since then I've found those grids to be fairly ineffective, it takes way too much time trying to select the grid to get into the properties.
So I created a similar family but it has a grid marker arrayed so the grid location shows up all along the grid. This has made working in Navisworks a million times easier.
Setting it up in Revit has not changed, so follow the instructions from the original post.
It can be downloaded here