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Access from above can be done, but it's entirely by feel. Even on the non-turbo cars it's virtually impossible to see while also reaching down there to get a socket on it. That said, I do like to be standing above the car when removing the bolt to avoid a coolant shower. Usually this means I crack it loose from below while I can see it, then get up top to finish the job when rounding it is much less likely since it's already started.
One thing I've found that helps a lot is to have a wood block to use as a fulcrum. You'll likely be using one or more extensions and possibly a u-joint to get the correct angle and it can be hard to get enough leverage without the entire assembly flexing up or down. If you can put the wood block under the head of the socket wrench it will help it turn without moving in other directions.
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