i had same prob had very twitchy rats at a dairy farm they seen you one they were away for hours.
so of course i hit YouTube looking for the best rat trap and i found it;
it was a big bucket and a bit of wood, the piece of wood is cut and hinged on so the end of the wood is center of the bucket with a small spring holding the wood level, put a bit of peanut butter of nutella on the end of the wood, when the rat gets to the end of the wood the spring gives to the weight then the rat.
then the rat falls in to bucket and the wood will reset to level position got 36 rats in 1 week that w