I have several Vivatek Panels purchased via IMEX - superb quality.
They are connected to the C2K Shared Device wifi, with no issues whatsoever. Then physically connected via HDMI to the C2K desktop in each room.
IMEX I believe are one of the few sellers who actually have the Google Play Store / Vivitek's own app store completely accessible via C2K Wireless. Our staff usually use them as a 2nd screen, but occasionally they use Note taking app, camera apps, YouTube etc independently on them.
I only wish people we in using them at present!