Is it a military ladder sight, or a "civilian" one in a conventional dovetail? How do you adjust it?
You still have to have a base to put the rings on. The side mount will allow rounds going in and out more clearance as it attaches on the side of the action and cantilevers over the opening instead of mounting directly on the top and interfering with loading and ejection. You may be able to find a two-piece base that mounts directly, but that is a gunsmith only installation as the screws on both pieces have to line up perfectly with each other as well as the axis of the bore.