I have a fridge very similar to that, you should be able to get 6 cornies in there without modification of the door (the back row will be higher than the front of course) The one in the middle for me is slightly problematic in that it tries to lean forward and that causes the door to not close well, I need to make a bungie strap to strap it to the back of the fridge.
Edit: also I drilled a hole in the side to get the Co2 in and the soda lines out, no cooling lines in the side of the fridge portion on mine (All the cooling power comes by airflow from the freezer section)
"People should not be afraid of their governments. Governments should be afraid of their people." - V
Secondary: Shady Lord RIS, Water to Barleywine, Pumpkin wine, burnt mead
Kegged: Crappy infected mild
Bottles: Apfelwein, 999 Barleywine, Oatmeal Stout, Robust Porter, Robust smoked porter, Simcoe Smash