Although the only time I’ve driven 3/4”x10 ‘ rods was quite some time ago when the job specs or if we were doing a 400 amp service would do the 3 rods in a triangle.
We have installed similar triad setups at the corners of the building with 3/4" X 10' rods.
Ahh yes, the magical triangle, makes money disapear without doing anything.
Roger