It seems that all Athom HomeKit plugs have the same serial number. This causes trouble in Home Assistant when you configure more than 1 plug.
This results in only having 1 entity even though you may have several Athom devices configured in Home Assistant.I just wanted to mention in case someone else has trouble with this. The issue is also explained here with more details:https://github.com/home-assistant/core/issues/34121
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In this case I have configured 2 Athom HomeKit plugs in Home Assistant. Notice that both are detected with the same serial number "SN8889704". From the Home Assistant docs I get that this serial number is reported by the device itself.
Can you confirm that this is the case? If so maybe we could solve this with a firmware update.