I have a few questions: Are they squared, so the seams don't have gaps? Can I park a car on top if necessary? How long does the odor last? Will they slide or buckle doing burpees?

Our 1/2" Mega Mats are not trued, meaning that there is potential there could be gapping if you put multiple mats together. We recommend when installing multiple mats, that you install them in a brick pattern. You can park a car on top of our Mega Mats. The only thing you will want to be aware of is if any oil falls on these mats that there could be damage to the mats. The oil from cars can break down the binder in the rubber making it flake. These mats do have an odor to them, so if you are sensitive we recommend mopping the mats with a mild soap and water solution with a synthetic mop head. You will want to make sure that where these mats are installed has plenty of ventilation as well. You may have to repeat this process a few times to truly get the smell to dissipate. These mats are very slip-resistant, so they won't move when doing burpees on them.