They spawn at random chances on all maps. So there is no such guaranteed places to farm them. You just have to farm in any mission except the very first mission (I haven't seen them in that map) called Aogiri Tree Hideout. Also avoid farming them in Disposal Facility because that map is very hard to farm alone, although there exists a chance to get Kisho Arima.
If you need Kishou Arima, play as Ghoul on hard campaign.
If you need Centepede Kaneki, play as CCG on hard campaign.
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