I want to make panels to place around trees to protect them from deer. I'd like to make the panels modular so I can assemble 3 of them in a triangle for a small tree, 4 in a square for a bigger tree, etc.

So I want to be able to fasten one panel to another at an angle as obtuse as 120 degrees (90, 108, etc.), and also have it be temporary, so I can reassemble the panels as needed.

What kind of joinery or hardware would make this possible?