I have not used the Blink white interior bracket with the Blink XT since I never had a spare one to try. I have Blinks Camera Systems in two locations. Northern Illinois were this winter has been crazy (-50) and in the south where temps do not go below 32 very often. I have found that the holding power in temps below 40 is not good unless you are using the XT in a garage or tucked up under a roof overhang.
For the Illinois location XT’s, I changed to the bracket in the photo below. While it will be more of a challenge to change the batteries (screws together with little screws), I do not have to be concerned with the camera dropping because of the “stock” XT bracket failing during extreme subzero temperatures.