I believe that the anchors should be set to the center of the ring so that it doesn't matter what direction the controllers are placed, CHM will recognize the same points. My anchors are two corners by my front door, about 5 feet apart. If I don't place them in the same direction when loading as when they were set then the entire virtual house is skewed. When setting the anchors, there's a crosshair on the ground (which cannot be rotated - I wish it could be, especially when placing walls and cubes) and a pair of lines showing the direction of both controllers (white for the controller itself and gray for its pair). I can align these virtual lines so that they're both parallel to their common wall, but the same markings are not present when loading the layout so I can't load with the same accuracy... I usually have to load 3 or 4 times, pressing the right stick and turning the controllers this way or that, until it aligns properly.

Hey, the anchor IS the center of the ring. I'm not even sure the rotation matters but i built those wierd grey alignment bars just in case. Gonna look into this next week. The alignment bars are there when you first setup, but they are tiny because you're scaled like a giant. It's a bug, I'll fix. 

I'm not entirely sure if the issue isn't something else entirely. Can you try and anchor that isn't directly up against a wall? 

Part of me feel like step one of setup should be "find and test a good anchor" because it's really the root of everything else. The logic is straightforward but there's just wierdness with the way the controllers behave sometimes. 

I do have better luck using two corners of the counters, although they're only about 3 feet apart, less than the instructions given - I figured putting them in corners where they're always in exactly the same place (and further apart) would help. The alignment bars and the big red-then-green loading pixel extending away from the controller (rather than straight up) hinted that direction matters... and indeed it does matter. Using the counter corners, I set the anchors with the controller triggers pointing at me.... then when I loaded, the triggers were pointed away from me and the entire layout was about 1 foot off (away from me). When loading using anchors in the corners by the front door, I adjusted the angle of the layout by pressing the right stick then rotating that one controller. I think I have better luck at the counter because I'm placing and holding them in a natural position, while the points at the front door are too far apart so I take them off my wrists and set them down separately. 

Bottom line, it seems like the green pixel is the anchor point rather than the center of the ring.

Also on the topic of anchoring... if I reset the Guardian (I'm experimenting with an oversized Roomscale Guardian vs turning Guardian off) with either a long-press of the Oculus button or by going into the Guardian Settings, the layout goes out of alignment by the same vector as the Guardian when anchored to the new Guardian. 

If the device goes to sleep (say, I take it off to answer the door then come back a few minutes later) not only is the layout skewed by angle but often lifts up a couple of feet, giving me the same perspective in VR as my 4-year-old in RL. This will definitely happen if the guardian is Stationary when it goes to sleep but opens at roomscale guardian when it wakes.

One possible solution is to return to alignment (with transparent walls and AR on) after any interruption of the app or guardian.