Smart Did-You-Mean is an extension, where you can implement a Did you mean ... ? functionality. More information here.
Set up container links as described here: Set container links
Add the following line to the file resources/views/Category/Item/CategoryItem.twig.
{{ LayoutContainer.show("Findologic::CategoryItem.SmartDidYouMean") }}
The Smart Did-You-Mean template takes care about the title of the search result page, therefore remove the Plentymarkets default title. Alternatively this code part can also be commented out as shown in the screenshot.