We bought this recently for the same reason (someone flytipping):
https://www.amazon.co.uk/gp/product/B07H7D83PZ/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
For £40 it’s been fantastic, the picture quality is way better than expected, even at night, and it comes with straps and a sort of ‘ball and socket’ mount that I’ve screwed to a wooden post. It doesn’t flash red when taking a photo.
I was worried about battery life but it’s been operational since mid-April and is still going.
Got some great pics of our cat, plus the local badger and foxes. Not sure about plates at night since we haven’t seen anyone around when it’s dark. The only caveat is it suffers a bit from condensation first thing in the morning, so you get a few blurry pictures.
For just under £40 way better than I thought it would be.