What's the maximum number of ad extensions that can show for a particular query or device at any given time?

Four (4) extensions.

Explanation:

Go-ogle Ads can be defined as a strategic advertising platform designed and developed by Go-ogle for use over the internet. It can be used to display product listings, services and campaigns to any web user over the internet.

Basically, for those who are relatively new to the Go-ogle Ads, the company provides a feature known as the dynamic search ads which helps various users to easily run a successful ad campaign. Through the use of machine learning, a dynamic search ad allows phrases and titles associated with a website to be automatically indexed and presented as a landing page to any user who is searching with the keywords.

The maximum number of ad extensions that can show for a particular query or device at any given time is four (4) extensions. The Go-ogle Ad extension platform is designed to display all the ads simultaneously or co-trigger and as such, the maximum number of ad extensions that are displayed per query or device are four (4).