Under because that way you can model it by making a cylinder and adding a plane to it, because the plane is attached to the back you don't have to do the extra work of making sure the textures line up.

I like it inside, where you loop it through the tube.

Under, 'cause cat.

I grew up with cats, so my default is under.

I don't even have a holder

https://i.redd.it/xz5fc4ae5hpz.png

Vertical over the toilet lid.

Look at the patent

Whichever you prefer. There is no correct way.

Over, unless you have a holder that covers the wall.

My holders were mounted vertically, so there is no over and under, only left or right. I’m so confused as to which way to put it.

I don't care as long as there is bogroll available.

Whatever way you choose.

Left is literally hitler.