At one of the Mac User Group satellite subgroups we use this 
to prevent people from tripping over the power cable that leads to the video projector & Apple TV. On previous occasions we've had to use masses of duct tape to try to hold it onto the carpeted floor, but it always wanted to curl back up into its transport configuration of a roll.
I got sneaky this time: Used some super-sticky adhesive Velcro hooks stuck to the bottom of the cable hider. Previous experimentation told us the carpet on the floor would work well as the loop part of the velcro equation.
Operation quite successful, the whole thing was flush to the floor, no gaps to cause trips & the velcro remained attached firmly to the hider when we packed up.