Ultimately, the front is probably the right answer to appeal to readers and buyers that look for this kind of validation to read the book. I am conflicted because I like the clean design of the front cover and adding this award seal makes it busy and detracts from the message of the cover art. However the goal is to get the book into more hands and to the population that values the award, placing it on the back cover means it will likely not get seen.
Ultimately, the front is probably the right answer to appeal to readers and buyers that look for this kind of validation to read the book. I am conflicted because I like the clean design of the front cover and adding this award seal makes it busy and detracts from the message of the cover art. However the goal is to get the book into more hands and to the population that values the award, placing it on the back cover means it will likely not get seen.
On the front!! Wear it proudly :)