Base for Bottle Holder

I really love the Danrusso middle finger bottle holder but it has one major problem, when there is no bottle the bottle holder falls due to a lack of balance.

I've just designed a base who must be glued under the arm, the base permit to maintain the holder when there is no bottle :)

The bottle holder is here: https://makerworld.com/en/models/436325#profileId-386807