Apple TV app

These are your options for external HDMI-connected streaming devices:

• Apple TV set-top box [best option for user experience, imho]
• Roku
• Fire TV

Devices you can use with the Apple TV app and Apple TV+ - Apple Support

It’s up to you. Most would prefer a larger screen.

All the ways to watch Apple TV+ - Apple Support

https://support.apple.com/en-ca/guide/tvplus/welcome/web