Yep I have a version of that hanging inside my garage. He bought them or they came with the roofing material and the Amish guy and I had a long talk about if I wanted them or not. we get so dang much snow some winters and with a full two stories and a 11/12 pitch I debated did I want 3-4 foot of snow on the house or have it slide off every foot or so. We don’t have gutters and if I ever got too worried I could open the attic door as opposed to getting out a ladder and risking my life. As it is it seems like right around a foot of snow it lets go. The one place I think next summer I will add them is where my side door is with a little deck where we come in all the time. There is a gutter there and when I’m grilling there mid winter and the snow lets lose it’s not a fun time. Other than that nothing gets hurt when the snow slides.You know, there's a invention for the roof snow issue.
https://www.metalconstructionnews.com/articles/which-snow-guard-to-use
At work they built a learning center and it had a huge dining area with a steep pitch glass roof. I would see 4’ of snow and ice on that thing and wonder. One day I was in there and the ice and snow started sliding with about 300 people eating. It was like the Titanic going down. Everyone was screaming and diving under tables. Nothing happened except it all slid off into the landscaping. Good southern design there.