I drilled holes in the back of my tables, so I cable tie my walls to the back of my tables, to avoid using the feet on a side wall where I have a neighbour. Occasionally, though, I have a neighbour who is putting a table there anyway on her side, and I can go ahead and have feet under her table - after discussing it, of course! I just finished a show where I had gridwall 16 feet by 8 feet and didn't use legs at all! There was pipe and drape, so I cable tied to the pipe at each end, and to my tables. Very solid.