I almost gave up on these because the panels do not lock in, at all. So, if you get one end in, and raise it even a little to attach the next panel, it pops right out again. It was maddening. I tried using landscape pins on the ends once I finally got a row done, but if you even tap the plastic holes with the rubber mallet I was using to drive those pins in, they break.It took the better part of three and a half hours to painstakingly baby these 27 panels into place which is nuts. It wouldn’t be complicated to make them snap into place and stay. Even a little resistance would be enough so you could pop them out if you wanted to, but to make them so even lifting it an inch pulls out all the other tiles is nonsense. I do like the finished product but I probably wouldn’t buy these again, nor recommend them to anyone else until the manufacturer rectifies that installation issue.