- Use no more than two extensions per campaign or ad group.
- Use extensions only at the ad group level.
- Use ad extensions only if you are advertising services.
- Use at least three extensions per campaign or ad group.
The Correct Answer is: Use at least three extensions per campaign or ad group.
Google selects the best ad for every auction, ensuring the right message gets in front of the right customer. When combined with three or more ad extensions, this best practice can result in even better performance.
Use at least three extensions for each campaign or ad group: At the time of each auction, your ad will be assembled with the most appealing extensions. More eligible extensions give your ads more opportunities to meet users’ specific needs.