Start by placing top left switch at Y 0, X 0 then you just measure distance between switches, for 1x keys it's 0.75 inches and when you want to place a switch just hit E over module that you want to place and enter enter coordinates, let's say you want to place next switch in same row and you have first switch placed at Y 0, X 0 you just add 0.75 inches to X and you get a position for your next switch that's how i do it at last, i hope that was helpful.