Since you are restricted on the tower location by the existing hole in the counter it might be safer to get a different fridge with no lines in the top to line up the hole in the fridge to the counter and allow for copper pipes, fan, etc. for cooling the tower. With the frigidaire or any other fridge, I would recommend running the lines out the top for the shortest distance of beer line without cooling. With a direct route (and even on my fridge with copper pipe cooling) the beer in the lines will be warmer then the keg so the first 4-8oz will be all foam. After that point there should be cold beer in the lines and you will get a good pour. If the run the lines out the back you will have multiple cups of foam before you get cold lines and a good pour.
There is definitely a coolant line somewhere in the back hump, I have seen it in photos on this thread. I have external CO2 in my setup I have successfully drilled a couple holes in the back drain hole and drain channel for these lines.