Can a Fireball be cast at the air to bypass cover?

I was sitting here, thinking to myself, “How does one hit multiple enemies that are behind total cover and low to the ground?”

Fireball states that it targets “a point you choose within range”, and hits everything in a 20-foot radius. So if I cast it 15 feet in the air so as to hit some goblins or whatnot that are crouching behind a short wall, or thick brush or something… would it still hit them even though I cannot see them?