Display a landscape ad through IronSource in Unity

Question

So, I'm creating an app that is locked to landscape view. I'm looking to have ads play at specific times, such as after completing a few levels or the player dies too many times.

These ads should be displayed in landscape view, which I'm struggling to figure out how to do.

NOTE : I'm displaying ads through IronSource and the code below displays the ads in portrait mode.

Current code :

public class TestClass : MonoBehaviour
{
    private void Start()
    {
        if (IronSource.Agent.isInterstitialReady())
        {
            IronSource.Agent.showInterstitial();
        }
    }
}

Any help is appreciated, thank you.