I know this is an old post, but I had the exact same question which brought me to this post. It may be worth making it a sticky or mentioning something about this in a documents/installation page. This is just my perfectionist coming through to make the app settings look neat 
Thank you @overeasy for the explanation!
Edit: I did look at the Configuring Power Channels (CTs) — IoTaWatt 02_03_20 documentation page but your explanation above explains the orientation perfectly!