Use the searchwp_term_archive_enabled filter in the SearchWP Term Archive Priority Extension to specify which supplemental search engines should include term archive pages at the top of search results

gistfile1.php

<?php

function my_maybe_include_term_archive( $include, $engine, $terms ) {
  // only have term archives included for supplemental search engine with name 'supplemental'
  return ( $engine == 'supplemental' ) ? true : false;
}

add_filter( 'searchwp_term_archive_enabled', 'my_maybe_include_term_archive', 10, 3 );