I have an older Kindle Paperwhite with no facility to play audio. However, I also have the Kindle App on my Android phone and my iPad. I can read my books on all three and use whichever suits me, Kindle keeps a note of my place too so that, no matter which I pick up, I can carry on from where I left off. The reason I mention the smartphone and iPad is that they both have the facility to play sound (you'd hope so with a mobile phone). If you buy a book for a Kindle that doesn't play audio, you can also buy the audio to play on smartphone or tablet on which you can also both read and listen to the book. I have used a Kindle Fire, I know they are popular but you don't need a Kindle, another tablet that may have more to offer than the Fire or a even a smartphone will do if you have the Kindle app.
I have one problem with audio books though, as far as I know, no tablet can actually identify the moment you fall asleep. I never seemed to get past the middle of Chapter 10 of the Rebus audio book I had on my iPod. Night after night, I started again at the beginning of the same Chapter. Things have moved on from audio books of course, now, with Amazon, you buy the book to read and add the audio if you want.