This mount was designed to work with the E3D Titan extruder in the Direct Drive configuration. It mounts on a MGN9H sled and does not work with 2040 extrusions since the E3D V6 hotend is not long enough to reach over the 2040 extrusion. A 2020 extrusion is needed. The hook is used for cable management and the thermistor and heat cartridge cables run under the 2020 extrusion. An external belt tensioning mechanism should be used since the belts get clamped between the MGN9H sled and the mount itself and can't be tightened by the mount itself.
I added a few images to imgur for more information about the design of the x axis: https://imgur.com/a/dLB9Kp0
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The holes in this mount are teardrop shaped. Therefore no support material is needed. Place the part so the teardrop shape points up.