I am a frame builder/ bike tourist; The low rider rack attaches to the rear (behind the fork) mount, the fender mounts to the front, or not at all if you use a (slide -on) clip on fender.

The standard placement for the low rider rack is between six and six and one half inches ( have put on quite a few at 6.25 inches) from the center of the rear rack mount and the center of the fork blade.
I am glad to see you are still touring. Last time that I saw one of your posts, you were in central America, breaking rack bolts like pretzels and thinking of heading for Europe.