MAS SDK gives you the ability to set a placement name(e.g. MainMenu, Upgrade_Level etc)。
Below are code snippets on how to set placements for banners, interstitials, and rewarded ads.
[[Yodo1Mas sharedInstance] showInterstitialAd:@"MY_INTERSTITIAL_PLACEMENT"]
Rewarded Video Ads
[[Yodo1Mas sharedInstance] showRewardAd:@"MY_REWARDED_PLACEMENT"]
[[Yodo1Mas sharedInstance] showBannerAd:@"MY_BANNER_PLACEMENT"]