My partner and I have three Kindles posted to us from Amazon Uk to France.
The Amazon Kindle Fire would have to be brought in or posted by a friend. I had to do that with mine to get an English one.
I bought a Samsung tablet in France for my wife.
During the initial setup, a ‘Preferred Language’ was asked for. I believe that this is common for most, if not all, computer devices.
My iPad, which I bought in England, has learned how to correct my French, and puts in the accents for me!
I can’t recommend it highly enough.
I have bought both Samsung and iPad tablets here in France and had no problem with language as you can choose that.
I would counsel against a Kindle Fire (which I also bought once, but returned).
I found that it limits your use of apps. And I also found it was very restricting when I want to watch British TV.
Try www.laptopsdirect.co.uk – they deliver to Europe. I have bought laptops from there with no problems.
I have an older Kindle and I use my Amazon.uk address. Everything is in English.