Hi man,
It really depend on what you are moving around and what is the landscape.
Begin overlap and event hit are both “childs” of collisions, you have to be sure that the meshes and actors, will generate overlap and hit (look in the detail)
By the way, you could just use a “linetrace by channel” and cast a ray under your character when you need it, that will give you an impact, if there is one.
You have to be sure that your cast dont hit your own player, or other things that are not your “landscape”