Also, Wilders pretty has a power base in Rotterdam because of the Fortuyn effect, but was Fortuyn successful in the Mijnstreek the same way Wilders is?
Wilders' power base in the Rotterdam-Rijnmond area doesn't entirely stem from the Fortuyn effect, it mainly has do to with a lot of white working class voters still living in that area (while these people have left to places like Purmerend, Almere, and Haarlemmermeer in the Greater Amsterdam area). These people live in Rotterdam but even more in places like Spijkenisse, Vlaardingen, and Capelle.
Wilders gets a "favorite son" bonus in Limburg. Fortuyn, on the other hand, didn't appeal to voters in impoverished areas like the Mijnstreek as much as Wilders. Fortuyn was a cosmopolitan, homosexual, in some ways a progressive politician. His anti-multicultural stance was pretty original. Wilders is more of a classical European new-right guy.