If you bust your ass seven days a week to support your dogs but can't afford to move somewhere that you are allowed to have them inside as you would like and can't afford to feed them anything better than a $19 bag of dog food, you might want to reconsider planning to add a dog, particularly a breed like a cane corso who requires heavy socialization, are typically protective and can certainly be aggressive without a lack of proper training (read: should not be left alone outside), and for whom eye problems and gastric torsion are common. They also need regular exercise and if you can't be bothered because you're too busy or it's raining/cold/muddy you should reconsider.
It might be a few years in the future but it sounds like you have a lot of things to get squared away before you should even think about adding another dog. By your own admission your dogs will not be anything but outside dogs "anytime soon."
This just sounds like a disaster in the making. You should strongly reconsider planning on a CC even if it is "a few years" out.
http://www.potrerocanecorso.com/is-a-corso-right-for-you.html