I added a second tower in, especially if you run a CR-10s Pro V2 or CR-10 Max which have a BL-Touch. you want to tie the wires to the somehow more rigid PTFE tube.
The base with the cutout allows you to travel further to the right without crashing into the side x gantry bracket.
for installation instructions pleas check the original model https://www.thingiverse.com/thing:3490047