Yes, even if you have ten authors, MLA only cares about the first one. It’s like being the first person in a conga line—you get all the credit for leading.
Don’t worry about listing “Smith, Jones, Lee, Patel, and Kim.” That’s a mouthful. Just “Smith et al.” and move on with your life.
The only exception? If you have two authors, never use “et al.” It’s just you and your buddy. Use both names every time.