We went through this process, where to put the kayaks that will be secure but not cause a back injury. Many boats use J hooks outside the flybridge or boat deck railing, which may work in your case. I'd suggest, though, that you test the ergonomics of the lifting required in securing and deploying the boats before making a decision. We have a big foredeck to lay them down on, and it doesn't impair the view forward from the lower helm. Easy to launch and retrieve in our case.
Ken on Hatt Trick