I need 2 4' wide rolls to cover the desired space. How do they do next to each other? Do they move apart easily since they're not linked? I'm having a problem with the linked mats separating while doing exercises. Will the same thing happen with these 2 separate large pieces?

Separation can happen with our rubber rolls, but depending on the size of the roll can be pretty tough to do. If you do experience any separation with our 3/8" Pre Cut Heavy Duty Rubber Rolls, we recommend adding some double-sided tape under the rolls. This will help to keep the rolls in place while in use.