Google AdWords has rolled out product status reporting and absolute top impression share to help advertisers see how often their shopping ads are shown in top position. These two features will hep identify product data gaps and measure competitiveness in Shopping campaigns.
Google says the left-most ad on mobile shopping results get 3 times more engagement, impressions in left most position are called “absolute top” impressions. Using absolute top impression share will show the percentage of time your product is showing in this position.