The closest I have experience of is with laminate flooring (interlocking engineered planks of MDF with a wood facing). On installation you have to leave a gap on every edge (say 1/2" in an average 18'x12' room) and cover with a finishing strip to allow the flooring to expand and contract with the variation in temperature - moisture plays a part too, it's recommended to unpack the boards in the room where they'll live and leave them for a day or so. They're manufactured very dry and the normal moisture in a house causes expansion. Without the gap you get a little hill in the middle of the room (or splitting if you fix the edges) and the joins are where it's worse because those are the interruptions in structure. Moisture again, warm summer air can carry more than cold winter air and concrete underneath can cause more to condense out into the covering - different underlay materials (or none, which is worst) make this more or less apparent in terms of expansion. Whether or not the mats in question are quite as susceptible to moisture and temperature as engineered wood I don't know (the 1/2" kiddy type jigsaw mats I have certainly move a fair bit), but I think it's worth considering.