Get the Samsung Tab A7 instead, its a much better tablet and it isnt filled with Amazon bloatware. Currently ranging from £120-160 depending where you buy it from but be quick. I bought my son a Fire HD 10 and it was ok until it got broken (my fault) so i bought him a Tab A7 and everything about it is superior. Faster, better screen, better speakers, better battery life (in our case anyway) and virtually no bloatware.
Downloading Google play is really easy
I think at that age you might be better of buying an android tablet with access to Google play store as this won't have access to it, although I believe you can side load the Google play store. At 8 kids will probably want to download games that are not available on amazon