I prefer under as we have a cat! Everyone else is over.
Cutting oil is my blood.
Except if you have animals in the house. Had a dog that would grab the TP and run down the hall. Putting it under made it harder for that to happen. Now that there's no animals (dogs or cats) in our house the rolls are set up over, like any damn fool should know.Any damn fool should know that over is the correct path!