I would assume that RAT (ADG) positioning has a lot to do with cable run lengths or hydraulic plumbing complexities.
The DC-10/MD-11 ADG is located near the cockpit, so that the mechanical deploy linkage from the cockpit is kept as simple as possible. It is also near the Avionics Compartment which houses some of the components that power the Aux Hyd Pump -1.
The L-1011 has a hydraulic-generating RAT that is located just forward of the main wheel wells. It was deployed by an explosive squib (no mechanical cables) and is close to the Hydraulic Service Center, minimizing the hydraulic plumbing needed from the reservoirs.
The 757/767's have a similar hydraulic-generating setup near the main wheel wells.
The 777 has both Electrical power and Hydraulic power generation from its RAT.
This plane is built to withstand anything... except a bad pilot.