I have to make our 1st floor height 'yard' safe for my toddlers. (it's a terraced garden, built into the side of a hill)Against the low wall I need to fence off is a 1 meter wide concrete pathway, so I cant dig down to fix the fence to the ground. So how does it stay up? Can it be safely nailed to a wall, or will that damage the wall? Or should the path be taken up instead? It's against a wall which is the retaining wall against the garden and my house, so it reeaallyy cant be damaged. Any ideas please?