I trained it without the center piece and some strategically placed objects on the spots that wanted to sorta bubble up around the vent. Did you slide it under the front near the windshield? I used a flashlite, and a knife/plier set and a book(hardback) and let them ride around on it a for a day moving them until it settled right in. Then I put the center piece in. The only area that needed a bit was the vent area and I put the stuff right on those spots and the carpet actually curved right into the vent area, then just laid the center piece on and it attached itself and sits great. Give it a chance, put the stuff on it and leave it in the sun.
If you can do the grill you can do the mat
Tracy