German neo Nazi towns exist, but they aren't real strong communities, think more of small villages where the overwhelming majority is ok with displaying nazi related stuff and neo nazi memes as a way to signal defiance, unrest and small scale civil disobediance.

You need four things in order to really form a community * the ability to meaningfully segregate or select - a town with 90% White Nationalists would suffice, I believe * at least some form of effective autarky - collective food production comes to mind * little to no government intervention or oversight with the most obvious being indoctrination of you children - ie home schooling * a spiritually united, fertile community of some size - this is maybe the most important aspect