I gave up using an elevated rest after wounding a nice buck when the arrow ended up on top of the rest instead of the on the finger.
I was shooting a Bear weatherest that was built out to center, and I had a plunger.
I was hunting Sitka Blacktail on Prince of Wales Island. I came upon a buck in a little cut in a bedrock outcrop. I pulled an arrow out of the quiver and set it on the bow without looking and took the shot. The arrow flew wild and hit the buck in the rump. Needless to say, I didn't get the deer.
I've had the arrow end up on top of the rest while practicing, so I know how the arrow acts when the arrow ends up on top. If you shoot with the bow straight up, you may not have a problem. I shoot with the bow canted, so now I only shoot off of the shelf.