The sizes for these stands are flexible. The width can be between 500-600mm on the Small model or 800-1200mm on the Large model. The height can be between 1550mm-1600mm on the Small model or 1800-2020mm on the Large model. Any changes will alter the upright angle so if you are producing graphics for multiple displays please ensure that they all are the same dimensions.
The grommets are about 30mm from the edge in all four corners so avoid putting important things like logos in the corner.