Only way I would exceed the size limit is if the bolt pattern (i.e. 200mm x 200 mm) for the TV matches the mounting bracket and the weight of the TV doesn't exceed the limits of the mounting bracket. The closer you are to the weight limit, I would use more screws for securing the mounting bracket to the wall to minimize any risk. If you have it in an area where it may be subject to someone (usually kids) grabbing onto it, then you may want to even provide more support.