The word "now" is just an adverb of time in these sentences. It means "at this moment" / "right now" / "from this moment and onward". In my opinion, it sounds weird to place "now" between "will" and its verb in the first sentence because it adds so much emphasis. I would word the sentence as "The setup will terminate now." Is the listener in so much danger that so much emphasis has to be given? :) The second sentence sounds like you are scolding someone, so I would leave "now" right after "will". However, the sentence could also be reworded as "We trust that you will consider this matter seriously now / from now on."