function main(){
var placementSelector = AdWordsApp.display()
.placements()
//fetches placements with campaign type of display network
.withCondition("AdNetworkType1 = CONTENT") ;
//you may change this depending on your requirement
.withCondition("Ctr > 5");
var placementIterator = placementSelector.get();
while (placementIterator.hasNext()) {
var placement = placementIterator.next();
Logger.log(placement.getCampaign().getName());
placement.remove();
}
} .withCondition("AdNetworkType1 = CONTENT")