nasaman,
I think I have answered this question before, but I am glad you brought it up again.
Now that I have removed the other devices, I just retried my dedicated line using 3 Puron’s.
Yes, 2 is better than one and I now believe 3 is still better. There is more minute detail coming through.
I also can say that the closer you can place the Puron to the wall outlet that your system is plugged in the better it performs. So, try to avoid extension cables etc.
ozzy