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1-1/2" I.D. works well with 1x2 target posts.If the holders are just going to be 2" pipes stuck in the ground, they'll probably fill up gradually with dirt and become useless.
A solution would be for the holders to be a short section of pipe elevated above the ground (involving some welded sections or something), so that dirt falls out the bottom.
My PVC stand is about 27" out-to-out and works well (easy to find cardboard backer in that width).
So about a 24" spacing would work.
Good observation on the dirt/debris issue.
One could weld a piece of 1/4" x 1-1/2" flat bar (or J-bolt) onto a section pipe (on the outside of the pipe).
Then embed the flat bar into the concrete with the bottom of the pipe elevated for a self-cleaning effect.
If the masses could only be educated on how to use them.....