Add content in between product rows in WooCommerce archives

Question

I want to show some content after the third product (and maybe the sixth, ninth...) of a product category. Not every category has that extra content or the same amount of it

Answer 1

Updated - Instead of overriding a template file, you can use the following hooked function, that will add a custom content full row in between each products row:

add_action( 'woocommerce_shop_loop', 'action_woocommerce_shop_loop', 100 );
function action_woocommerce_shop_loop() {
    // Only on producy cayegory archives
    if ( is_product_category() ) :
        
    global $wp_query;
    
    // Get the number of columns set for this query
    $columns = esc_attr( wc_get_loop_prop( 'columns' ) );
    
    // Get the current post count 
    $current_post = $wp_query->current_post;
    
    if ( ( $current_post % $columns ) == 0  && $current_post > 1 ) :
    
    ?>
    </ul>
    <ul class="columns-1" style="list-style:none; margin:0 0 3em;">
        <li style="text-align:center; padding:2em 1em; border: solid 1px #ccc;"><div class="banner"><?php _e("Custom content here"); ?></div></li>
    </ul>
    <ul class="products columns-<?php echo $columns; ?>">
    <?php
    endif; endif;
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.