A:AnswerAs long as you have enough HDMI ports on the TV, the Roku and the Apple TV can coexist. The Roku also offers an Apple TV app, so if you don't use the Apple TV for gaming or as a HomeKit hub, you could retire the Apple TV or move it to a different TV and access Apple TV content on Roku.
A:AnswerYes. As soon as you set up the Roku on the TV and put in your WiFi password You can use it to stream movies and shows from different services directly to your TV.
A:Answerim not sure about the apple tv but it does offer alot of different channels like hulu, netflix, disney, and many more you can see the specifications before you order so it should be on there whether or not its offered. but you could also talk to someone at bestbuy before you purchase it to be sure they should be able to help you. sorry i couldnt be of more help but i just recently got mine and im not sure all the channels and stuff i can get yet either.