question about "unity adds reward videos"

hello there, iam realy intrested in unity adds reward videos. i want to use them maybe in my oncoming game super mage world. but before i do so i got some questions. i would like to insert the adds just before the beginning of the first level that gets started, before the add apears the player gets an pop up and gets an decission to buy the game or to watch the add. then after completing 3 levels or loosing 3 lifes i use the pop up again with the question to buy or to watch an add. is these ok to use it this way ? i would love to use it this way. all my players wouldnt get anoyed by suddendly apearing add media on screen and for unity it should be a good deal too, the player is informed about the add and would only click on it if hes realy intrested. the game is for android and iam going to release it in the next coming days.

nevermind, would not be the correct ad for my game. i think its much better on other games.