Show one post per author and limit query to 8 posts

I want to show 8 recent products from multiple authors on the frontpage.
Need to show 1 recent product per author.

Currently i’m using basic wp query to show recent 8 products.

$args = array (
'post_type'              => array( 'product' ),
'posts_per_page'         => '8',
'order'                  => 'DESC',
'orderby'                => 'date',
);

// The Query
$query = new WP_Query( $args );

What’s the best way to achieve this?