whmcsDNSManager/modules/addons/DNSManager2/models/customWHMCS/product/product.php

<?php

namespace MGModule\DNSManager2\models\customWHMCS\product;
use MGModule\DNSManager2 as main;

class product extends MGModule\DNSManager2\models\whmcs\product\product{
    function loadConfiguration($params){
        return new configuration($this->id);
    }
}