You should check out this product.
Came highly recommended by two people from different industries.
Works using simple barrier and odor.
I'm setting some up today to keep the deer off my sunflowers and Dahlias.
They have ate most of the tops and buds off of my Echinaceas, which are usually listed in the deer-proof/resistant lists. My deer can't read apparently.
Gonna put some around them too.
https://www.plotsaver.com/