Do towers reduce plunder? Or do towers only take up space which limits plunder increase from another building?
Reduce, but only because you are getting stronger without increasing plunder. It's not like the building reduces the plunder as part of its effect, it's just a side effect.
Thanks for the replies, perhaps there should be a guide for towers? I would be interested in the numbers and proof.
Each HF tower I added reduced my total gold in 3x HTE by 3 mil. That's with EE lvl5. So that equates to 2 mil drop per tower without EE bonus