Are you hoping for a van service? I couldn't find anything on a quick search for Malpensa. Taxis appear to be at least 65E and are likely to take four people at the most.
It looks like most hotels recommend the shuttle services from the train stations. There is a shuttle bus service that leaves from Milan's Centrale train station and the Malpensa Express train runs from Milan's Cadorna Station. Both options are very easy and with a noon departure you should have no trouble getting to the airport on time. Unless you're concerned about luggage, those options are the least expensive.
Sorry I couldn't be more help with a hotel-to-airport shuttle service. Maybe your hotel can suggest one.