Do these mats shift? I will need 7 for my garage gym. Do I need to tape or glue to keep them from separating?

Our 3/4" Premium Extreme Mats typically will not shift while working out on them. They are pretty heavy and it takes quite a bit of force to move them. If for some reason the mats did slip, you can add some double-sided tape under the mats to keep them in place.