Ignite can work with multiple TVs, however, you would require one box for each TV just like with digital cable. The installer would take care of the appropriate setup, but make sure everything is working before he leaves. Each box communicates via WiFi with the main "modem".
With only one box, it may be possible to utilize an HDMI splitter to send the signal via HDMI to each TV, but then all the TVs would see the same thing and it might cost you a lot for splitter and very long HDMI connections. Best to get a box for each TV.