I always shiver when I see those display boards on a breeze block wall as a significant period of time was taken up helping to mount around 30 or so of them in a previous job of mine, when I had far too much work to do that I’m actually good at. The organisation I worked for had a dedicated property services department with the skilled staff needed to do such tasks quickly and to a high standard, but due to budget allocations and politics they were all installed by possibly the two worst DIYers in the building, of which I was one.