I am about to start putting french cleats on a couple of walls in my shop, and I've watched a ton of online videos just to see how other folks do theirs. No questions about how it's done, but I see the cleats on the wall spaced everywhere from 2" apart to 8" apart, sometimes even more. For those of you who use them - what did you use for spacing and why? I really can't figure out the logic for any particular spacing other than what might be visually appealing on the wall. I'm going to be using the cleats for custom tool holders, movable shelves, clamp racks and generally some pretty heavy items. Mostly things I use frequently and don't want to dig around in a drawer to find.