You would build them in a developed country because cheap labour has no real impact on your cost of goods when dealing with this level of automation. A developed country gets you better infrastructure, access to the educated workforce needed to maintain and adapt your automation, and you are closer to your market.
I would think you would build them as close to your main markets as real estate and electricity costs will let you, to lower transportation costs and to allow you to be sloppier when predicting demand (no longer thinking in terms of shipping containers arriving at the warehouse next month). Which probably means developed countries like you suggest.
