Keeping Roll Out Mats together: Feedback Req'd

So i have four 40'x 6' swain flexi roll mats.

they MUST be rolled out and rolled up every day. Not permanent fixtures.

any clever ideas on how to keep them from separating from each other along the edges (W/OUT use of mat tape)?

anyone use somethign like some "book end" type stoppers on each end of the mat that are held in place to the floor w/ a suction cup or something like that...

mind you, it can't be permanent.