No, you have to install - slightly fiddly process, but really easy to do. Loads of sites telling you how. Firestick is great - very slick.
Defo get a box not a firestick. but if your wanting to replace sky there's a much better option than kodi via your satellite dish
Have a look at these boxes , vu+ solo2 mini im in the process of getting one , hopefully its gunna be o.k. For those of you using firesticks etc. that work on P2P , Get a VPN !!! which doesnt log your traffic , Ive been using this one for years. https://www.privateinternetaccess.com/