Unity Ads some important question..?

Dear Friend,
At first take my Love. Kodular is one of the best app builder platform. But my question is–

  1. I want to make block like this-

When Unity Interstitial Ads failed to show
Then
Show StartApp Interstitial Ads

Dear expert, Plz give me a solution. For your kind information, I can do that
StartApp to Unity Ads because of StartApp have their block When Ads faild to show… My first priority is Unity Ads.

Regards.

I think you can do this Ads Load Failed to Load another Ads nekwork