Amazon Kindle is a great format for publishing a novel, as I have much experience uploading my work to them for publication through digital channels. I also have published my books through Nook and on Smashwords. However, Amazon wants exclusivity if they are going to enroll you in KDP. According to their FAQ page:
What does it mean to publish exclusively on Kindle?
When you choose KDP Select for a book, you’re committing to make the digital format of that book available exclusively through KDP. During the 90-day period of exclusivity, you cannot distribute your book digitally anywhere else, including on your website, blogs, etc. However, you can continue to distribute your book in physical format, or in any format other than digital. If your KDP Select-enrolled book is found to be available elsewhere in digital format, it may not be eligible to remain in the program. See the KDP Select Terms and Conditions for more information.
If my book appears to be available for sale or distribution on another website, is it eligible for KDP Select?
No. If your book is marketed in a way that indicates it is available for distribution, for sale or for free, then it is not eligible for KDP Select. For example, one of the possible indicators that the book is available for distribution may be the presence of instructions on another website or sales channel for downloading or obtaining the book.
Can I re-enroll my book in KDP Select if it was removed previously due to violation of the exclusivity requirements?
Yes, you can. Once you ensure that your book is not available elsewhere in digital format, it is eligible for re-enrollment.
I gave a third party the right to distribute my book through other websites, and my book continues to be available through that third party on another website. Can I enroll it in KDP Select?
No. If you gave a third party the right to distribute your book and it is available through that third party on another website, you cannot enroll it in KDP Select.
I wanted the self-publishers out there to be aware of this fact. Please read the fine print before deciding to enroll your Kindle edition in KDP.