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Getting this book. Can you inform if it is okay for WW to see this on my bedside, or should I keep it secret by getting ebook/audiobook?

Absolutely not. You’re not getting the book to manipulate her, you’re getting it to improve your mindset. Why on earth would you let her see it? Even if it wasn’t deliberate but she happened to see it on the bed stand she’ll think “oh he’s left that there for me to see, he’s trying to prove he’s worthy, how weak is this guy, his changes are temporary.”

Get the audiobook. It’s for you and you alone, nothing to do with her.