Hey meeshl!

Yes, we dont really recommend attaching any tether to the sliding mechanism of the front seats. Not only can the passanger not move the seat, but it can also rip and shread the webbing of the tether strap. Try to find something on the floor of the seat thats not attached to the seat slider, but attached to the frame of the vehicle. If you dont have any luck finding anything, make an appointment with a tech, and they should be more then happy to help you out!

Jessica
Certified Child Passanger Safety Tech
CPSTech@carseatdata.org