The main reason not to mount there is that it will get in the way.
I've found that it resonates better in the lower bout, but with your Ovation, you're not likely to be able to find a good location in that area.
For now, that will be fine as long as it's out of the way for you.
Some Ovations work, but it will be a very technical install and you must have a way to get inside the guitar. We've had good luck with the Celebrity Elite and others with the access plates on the back. Others without a standard sound hole or access plate will be incompatible. We're hoping to have a better solution soon.