Sorting Query Results by Multiple Meta Keys

query_results.php

<?php
// Query Arguments
$args = array( 
	'post_type'       => 'review',
	'posts_per_page'  => 10,
	'paged'           => get_query_var( 'paged', false ),
	'meta_query'      => array(
		'relation'    => 'AND',
		'be_top_pick' => array(
			'key'     => 'be_top_pick',
			'compare' => 'EXISTS',
		),
		'be_price'    => array(
			'key'     => 'be_price',
			'type'    => 'NUMERIC',
			'compare' => 'EXISTS',
		),
		'be_rating'   => array(
			'key'     => 'be_rating',
			'type'    => 'NUMERIC',
			'compare' => 'EXISTS',
		),
	)
);
// Sort Results
$current_sort = isset( $_GET['hosting-sort'] ) ? esc_attr( $_GET['hosting-sort'] ) : 'most-recent';	
switch( $current_sort ) {
	case 'most-recent':
		$args['orderby']  = array( 
			'be_top_pick' => 'DESC',
			'post_date'   => 'DESC',
		);
		break;
		
	case 'price-high':
		$args['orderby'] = array(
			'be_top_pick' => 'DESC',
			'be_price'    => 'DESC',
		);
		break;
		
	case 'price-low':
		$args['orderby'] = array(
			'be_top_pick' => 'DESC',
			'be_price'    => 'ASC',
		);
		break;
		
	case 'rating-high':
		$args['orderby'] = array(
			'be_top_pick' => 'DESC',
			'be_rating'   => 'DESC',
		);
		break;
		
	case 'rating-low':
		$args['orderby'] = array(
			'be_top_pick' => 'DESC',
			'be_rating'   => 'ASC',
		);
		break;
}
$loop = new WP_Query( $args );