I cannot use a hanging system in my store because there are so many windows in the building. 95% of the wall space is broken up by a window, so most of the walls are only 30" - 48" wide. However, one of my clients is a restaurant that we will be putting our feature artists into, so we will be hanging new art every 4-8 weeks. They have four 10 foot expanses of wall that we will be using and we are thinking about installing a hanging system. Opinions, please! What's the best system out there? How easy is it to install and use?