I attached the plugin to my robot and got point cloud with gpu acceleration successfully. But I found that there were some beams look through the ground plane(x-y plane in rviz). However, the point cloud is normal (above the ground) when I use the cpu plugin .
My ros version is Kinetic on Ubuntu 16.04, and gazebo 9.18.0.
GPU plugin(the yellow line is the grid plane from side view):