How do I know which side is facing up on the Center Trim? A How do I know which side is facing up on the Center Trim? There is no right or wrong way to install center trim. Most people install center trim with the widest part of the trim on top of the mats. Share facebook twitter linkedin pinterest email Back to Top What is a “Parking Pad”? How does this hold up to magnesium chloride which is the salt used on the roads in winter where I live?