A dedicated router is not required for LED video walls but the Virtual iPad still needs a constant reliable connection to the network in order to receive timetable updates and content downloads.

For multi-screen setups we recommend using an HDMI splitter with EDID as well as an audio extractor within this 

setup.  The audio extractor is inserted before the HDMI splitter.

Tried and tested HDMI splitter with EDID & audio extraction:

Blustream SP12AB-V2