My wife is a cat lover and I can tell you from first hand experiences that nearly all cats are crazy. Sometimes its almost like an internal switch that is set off and they start acting out. Since we've moved into our new house 5 years ago we've been lucky that our 4 cats did not urinate on anything but after a few years of being here without incident 2 of them began pooping in the house. One would poop in nearly the same spot about 4 feet from the entrance to the gigantic cat box in our laundry room and the other would do it in random places. We put one in a cage for about 2/3 of the day for months. That was messy and a PITA. We eventually had to put the 2 cats outside to the dismay of my wife. One came up missing after a couple months and the other suddenly got sick and died. We are now down to 2 cats and everything is cool. I think sometimes its too many cats using the same box even if you keep it clean other times who knows. We have one cat that is really awesome, he's really like a good dog trapped in a cats body. If there was only a way to pick out a cat as cool as him. If it were up to me we would never get another cat but my wife has at least resigned to a 2 cat max.
I have five big litterboxes for my two kitties. Two upstairs and three near the basement.
Of the people I've met that have had pee/poo issues, there is typically one litterbox and it's hidden somewhere in the laundry room...which is usually dark/humid/scary. Not a place you would want to pop a squat.
My issue with both of mine though is that they LOVE To kick fresh litter all over the fucking place. I need to get better litterboxes to prevent this, but it's like they don't want to step on a clean carpet pad before entering the litter box....they want that clay dust all over the fucking place