Drones. Which drone for monitoring goats and perimeter?

Any ideas on what drones to use to spot goats and observe herd behavior? I also want to us it to fly the property line. I only have 36 acres. Not looking to spend gobs of money on one.

This is one of the ones I have been looking at:

https://www.amazon.com/gp/product/B085HNMHKJ/ref=ox_sc_saved_title_2?smid=A3QTILSGJZUURE&psc=1


https://www.thegoatspot.net/posts/2717903/bookmark