Behind-the-seat bottle mount w/ Prolink seat

I’ve decided to go back to the saddle I really like (the Azoto doesn’t work for me) which is the Selle Italia ProLink Gel, but it’s got carbon rails that get much wider in the back so it won’t accomodate my saddlewing.

Does any one have any success using another behind-the-seat bottle mount with this saddle or any other with the same issue?

I ride a P3 so it was to mount to the seat, since I can’t use the AquaRack off of the seat post.

Marcel