You don't need a drone. Ukraine has these, and there are numerous videos of them taking out Russian vehicles.

https://en.wikipedia.org/wiki/PARM_1_mine

How about an automated weapon you shoot from a howitzer 15 miles away that autonomously surveils the area under it's impact zone for a couple armored vehicles and reliably eliminates them?

https://en.wikipedia.org/wiki/SMArt_155

You can actually see video of these in action in Ukraine. Bofors has also produced the BONUS round which is basically identical in action.