Google is showing related searches in the middle of the mobile search results page (click to open the image in a new tab):
The feature that we are used seeing at the bottom of the SERPs since 2006 , in this test can be displayed at as high as position 4 of organic results.
Just over a month ago Google launched a new UI for the “people also search for” displayed when a user clicks on a result and then clicks back to the search results page. This feature is obviously aimed at increasing the number of searches users conduct. The new “related searches” position test seems to target the same goal suggesting users refine their search even before they can all the results on Page 1.