Just place mounting holes ( 2 actually, spaced at least the drill diameter from each other) slightly bigger than the overall cable diameter. Check with the board house what drill sizes they use as standard, and use the one bigger than the cable. As well place the first hole more than 2x the diameter in from the edge of the board, so that it will have some strength. As well do not route traces in this area, and keep ground planes out. Soldermask is fine, along with screen print of the pad use.