I am now such a cardboard tube enthusiast that I started an entire thread about them.
I bought them from Custom Tube Company in Inver Grove, MN. You may be able to find somebody local.
I did not use adhesive and don’t think there is much of a point. With the vertical walls on all sides, they are stable.
I did not tilt them. I made sure my shelves were very level and is attached to the back wall. Also in my case, the doors close to be working a couple of envies of the shelves, so if something tilted forward when I’m not around the door would stop it.