You know that special symbol for water valves and fire hydrants that the engineers want to see in profile views of water lines? Ours looks something like this:
If you think it's a structure style, then you're wrong. It's actually a label style that uses several custom expressions. I use a block that is a rectangle on a no plot layer for the structure in profile view. You can leave the no plot structure visible, or you can turn off the display of the structure in profile view once you've added your labels.
This label will move with the structure, adjust to the size of the structure, and adjust to changes in the surface referenced in the structure. Adjusting the custom expressions, you can control how far all four sides of the rectangle are from the center of the structure based on the size of the structure.
Now if only we could assign a default label style to each structure in profile view I could finish my P&P sheets even quicker. For now, I'm just happy that I don't have to place a dynamic block at each structure then remember to go back and move it as my structure moves to an updated location.