camp on top of the stairs on the rear teleporter (the one you start facing) so that all the zombies are funneled down that walk way towards you.
With two people we've got to lvl43, by about level35 its too hard to camp anywhere so you just need to keep running between portals and turning on the electric barriers. We had a ray gun each, wunderwaffer and mg42 as backup weapons, all upgraded and both with monkeys and perks (except double tap)
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