Navigating that city is a whole different beast and having a ride that doesn't feel like a toy makes the traffic way more tolerable. It saves a lot of face when you can pull right up to the entrance of a high-end spot and the valet doesn't give you a cold shoulder. Check out car rental options in Moscow here:
https://getrentacar.com/en-US/russia/moscow . This site lets you filter for the class of vehicle you need so you can lock in a model that fits the corporate vibe perfectly. You get to see the actual photos of the fleet which helps avoid any surprises when you land and head to your first meeting. It is the easiest way to secure a professional set of wheels for the trip without having to hunt through a dozen different local sites.