I have the Flo app on my phone, a Roku tv with Flo downloaded in my bedroom and garage, and hook my laptop to my TV in my living room. All work just fine. I have terrible internet, but apparently good enough for Flo.
I'm with Eric, have awful internet but hardly ever have issues with Flo working. You can watch online (website), app, or on most devices like Roku,Chromecast or whatever....best $150 you'll EVER spend