Best root bone position on a quadrupedal skeleton?

I’m trying to rig a horse for Unreal and I was wondering the optimal positioning for the root bone. I’ve seen many examples, some people put it off-center but paralel with the pelvis bone, others put it at the center but still connected to the pelvis, and others (and this just seems wrong) place it at the center and parent it to the middle spine bone, effectively creating 2 retarget chains for the spine, which is terrible. So I wanted to know what is the priority, that the root joint be at the center of mass or that it is parelel to the pelvis bone?