There is no reason to put woofers near the floor, just comprimises[sub to small needs floor boundery reinforcement ,most speaker builders place woofers near the floor because its the only place left also its traditional, people expect the woofers to be near the floor ]ask any dealer .people are scared by things that are diferant ,has to be a wood covered monkey coffin to sell ,boring!!!.try lifting it, if your sub is well designed and fits your room well it should sound much cleaner and better defined ,less standing waves .enjoy .
