The author remixed this model.
This is the remix of “MultiBoard alternative free standing foot” with slightly longer base on the front and back to avoid wobble when there are heavy objects on the board.
Please print 2 copies or more of the desired size.
Added 4 variants of varying extensions at the back and front:
Please use the desired length based on the positioning of the board.
Personally I would suggest to use 0mm back and 50mm at front to make sure everything is supported. It ensures the space at the back is not compromised.
If 2 of these are not enough, consider printing more of these and add on the entire base of the board.