In this case, it might work, since the roll animation is not going up in the air. However the automatic generation of the root joint done by Mixamo causes the root to get some rotation applied from the projection on the the ground plane. This can cause issues. I have personally done the fix for Mixamo animations and root motion by using their normal FBX download option and then adding the root manually in Maya and then copying relevant keys from the hip (which is the root for Mixamo) onto my new root joint.
If this doesen’t make sense, i’ve made a video showing the process here: Part 1 - Howto get Mixamo rootmotion into UE4 - YouTube