I thought that South Korean and other markets used Schuko Plug connections. Is it possible to have a polarity issue with these? I was under the impression it didn't matter with pin went into which hole, by design?

Unless you are talking about the plug itself?

Primary: MD600, MS200 (SpeakerLink to AES), Trinnov ST-2, Ayre V6-xe, Salk SS8 3x LRC.
Secondary: MC600 (whole house).
Zone one: 568.2, G57, MS200, Spatial Hologram M2SE.
Zone 2-6 (Awaiting assignment).