This may be imperfect, but you should be able to get the effect you need with a dashboard on-hover action and a shape worksheet (using [Height]).
I used some random shapes, but you could certainly substitute your own.
If your elevations are limited to just 3 values, you're set. But it might be prudent to use a calculation to set the shape (LOW, MEDIUM, HIGH), just in case an unusual elevation slips in there.
Let me know if this helps!
Datasheet-10101234_tabe.twbx 78.9 KB
Please let me know if I misunderstood your request: do you want to see the appropriate symbol displayed all over the map, or just when the user hover overs the point?