I use baffles to control squirrels at scores of orchards and have for about 20 years. These are built with roofing coil and painted with a well mixed combination of motor oil and axle grease. I use brown axle grease because the red stuff looks disgusting.
I have seen other designs, but these we can put up in a few short minutes. We recently discovered the beauty of a Ryobi battery powered staple gun which makes it easier to do because it is stronger than the strongest manual ones.
At some sites squirrls only jump about 4 feet… 5 feet is usually an adequate distance but a rare site with olympian squirrels 6.5’ may be necessary.
If oil flows onto the bark of peach or plum trees on hot days it can injure and even sometimes kill them. Before I became aware of this I used only one 24" wide piece at the bottom of pre-painted coil and a 20" piece above it stapling the bottom first. If we use an additional 24" piece we usually can build it from the ground up which stops the oil from ever damaging the wood. These also seem to add extra protection from literally starving grey squirrels.
We remove and re-install them every year keeping them on the tree only as long as necessary to protect fruit.