You really don't want to go above 95 just in case. Although I've never heard of a Ball getting burnt at 99 degrees, you never know..
My adult CB-70 rack stays steady at 88-90 but there's one tub that goes up to 96-97. There's nothing I can do about it and she is fine with the higher temperatures.
I am sure they can handle it but if you can get it lower, I would.