My family is looking at cutting the cord (or dish signal, as it were) and just had a few questions about Hulu with live TV

Can any smart device with the Hulu app access Hulu w/ live TV, or is there a different app specifically for the service? We have an LG smart TV, an older (5-6 years) Vizio smart TV, an Xbox one, an Xbox 360, a current Firestick, and an older firestick, all of which we would like to be able to use to access the service

Are there any major channels missing from the lineup? We looked into cutting the cord a few months ago and were going to go with Directvnow since we’ve had directv for years, but they recently raised prices while slashing their channel lineup