do take note that ESP/LTD/Edwards Vipers with the front strap button located behind the horn tend to neckdive, compared to those located at the tip of the horn or behind the neck.
you wont find many vipers with the strap button at the tip of the horn tho, due to worries that the small piece of wood at that area might give way. But i doubt it, unless you swing your guitar and do all that crazy stuff