True. Flat against the window is the best way to reduce glare, although even when it’s flat against the window, the distance between double-paned glass can cause glare. Personally, I have mine against the window and angled slightly down. That means the top edge of the camera touches the window and the bottom part is slightly away from the window. But there was glare even when it was flat against the window, due to the two panes. I’ve addressed the glare issue in another way: