>>23392381
The most basic anti-tank drone is literally just an RPG warhead strapped to a small drone. There are drones that drop grenades as well, but those are meant more for anti-infantry and there's no point using that against a tank unless the hatches are open and it's not moving.

RPGs have disabled mobile suits before, but only by hitting certain spots. To guarantee a kill, you'd need ambush tactics with multiple drones.