I built a lack enclosure and placed the lcd outside. However the ribbon cable running exposed bothered me both aesthetically and for its long term safety. Furthermore it catches on the bottom of the enclosure doors.
The shelf I'm using is muscle rack with sheet steel on top. I didn't like the idea of cutting through this and possibly damaging the ribbon cable on the jagged sheet steel.
I created this grommet to both protect the cable and look a bit better than a drilled hole.
It is designed such that each part has a male and female end, if you print 2 they will click together.