As the GeeekPi Raspberry Pi 4 Ultra Thin ICE Tower mounts from the underside of the Pi with either bolts or standoffs I had to modify the LDO recommend mount.
I used the 4 x M2.5 standoffs that came with the ICE Tower to mount the ICE Tower to the Pi. Then I used 4 x M2.5 x 8mm Button Head to mount the standoffs to the Pi bracket.
The author remixed this model.
I modified the LDO recommended Beefy Raspberry Bracket Pi mounting holes for the screw in standoffs