I don't know where the "2-3 meters" thing came from, but it was probably coined by someone who doesn't know much about metric measurements. That's 6.5 to 9.8 feet, which is absurdly huge for a species that's never been portrayed as larger than normal human size. You should just ignore it -- it's a silly mistake somebody made. If Memory Beta gives the 2-3 meters figure, then it's just one more indication that Memory Beta is not an authoritative or consistent source and doesn't have very good quality control.
In short, don't be so dependent on written authority; feel free to apply your own judgment.