"Is the taxi here?"
Here is an answer! Basically вот is used for objects and здесь for places.
What i understood is the main word is in your answer здесь the uncertainty is on the taxi . Здесь такми means is there a taxi? Or maybe its an ambulance. Conversely такси здесь the main word is taxi. E dont know if its already here. I had this explanation by a russian friend.