How to Connect Pioneer Cassettes, Ceiling, and Floor Units to WiFi

This video shows how to connect your Pioneer Light Commercial AC (LCAC) to WiFi and control it from your smartphone. Supported series are CYB, UYB, and RYB (meaning, the indoor unit starts with CB, UB, or RB). Download the Nethome Plus app available for iOS or Android.
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Is there any documentation on how to mount the WiFi unit with a concealed cassette? I don't need the module physically visible.