In one of my cases my Kenya tree has moved from its frag plug to the rock my guess for better flow but it just shows how awesome these creatures are.Yes a lot of people actually do just cut the coral right off the “frag plug” you are describing I just don’t do it cause I’m usually a nervous Nelly handling coral haha but yes you can have the coral without the ceramic discs/frag plugs. Or even cut the pillar part of and just have it flat.