Maybe. Ours is hollow and appears to just be decorative - there's a hole in the back you can reach your hand in, and I can reach my hand up into that bump. In any case, it interfered with the typical bidet installation plate that has two rotating rings with slots in them for the bolts. I managed to get ours attached but it's too far forward and not as comfortable to use as I'd like. As you can see, the plate is just barely fitting in front of that bump and it really wants to be 1-2" farther back. I may have to cut it to get more clearance.