It’s’ in the core file: /CT/taxonomy.php.
When you look at the bottom of the page you’ll see a few lines of code:
</div> <?php } ?> <?php hook_taxonomy_title_after(); ?> <?php get_template_part( 'search', 'results' ); ?> <?php get_footer($CORE->pageswitch()); ?> <?php } ?>
You should be able to place your content after the search results request.
Be sure to make a backup copy of your original /CT/taxonomy.php file first.
Note: This was from a CT 8.9.6 file.