Recessed Fascia Devices.
Avoid having anything protrude into your aisles whenever possible. Typically, our aisles are much too narrow - after all, we want more layout, not more open space! Anything that protrudes into that narrow space we leave for ourselves can cause a multitude of problems, from bruises to our bodies caused by bumping into the protursion, to accidentally changing a control on the layout (#*@&^%, the switch got thrown under my train - again!), to knocking something onto the floor, or even breaking something off.
Shown here are details of how the problem was solved on several layouts that I have been involved with, including my own. By recessing everything into the fascia, the above problems are avoided.
An added benefit is the clean appearance of the fascia and layout area when the protrusions are eliminated.