How do I check if an object is at a certain x/y location?

I am trying to avoid multiple objects layering on top of each other. In this case, I have conditions that check for left button click, that a certain tile is in the ground tilemap, and if there is no object "Tomato" within the same snapx/y spot. However it still seems to be overlapping in the same position. Any ideas?

Thanks!

Upon clicking a position in the tilemap, you can check if the mouse is over a tomato.

Upon clicking a position in the tilemap, you can check if the mouse is over a tomato.

Thanks as always, haha! I actually tried that but realize now that I need to adjust the collider. If I click within the tile it places the object multiple times but if I click on the object itself, it doesn't.