Hello Roman, if you want to attach these, you can attach a tensioning strap to the top and attach it to the rear headrests in the car.
car. In my case, I have solved this by placing the box on an anti-slip mat in the boot, which works perfectly.

Kind regards

The box has Velcro on the underside, which sticks very firmly to the carpet in the boot. In addition, the box is so large that it would have no room to move, at least in our car.