How can I get the Laser Pointer from Easy Controller Selection guide to 'collide' with UI Canvas?

I have followed the tutorial at https://developer.oculus.com/blog/easy-controller-selection/ and succesfully got a Laser Pointer to interact with world-space UI canvases, but the laser beam (from OVRPointerVisualiser) attached to my controllers goes through the canvas, despite working for interaction.

Is there a simple way to allow the laser pointer beam to 'collide' with the canvas to display a dot or ring moving along the canvas panel surface, instead of just travelling through the canvas? I know I can adjust the length of the laser beam but I have UI panels at different depths so need the laser beam to display a dot at different depths per each canvas.