In my experience, the degree of improvements one hear from these noise filtering devices are in direct correlation of your components downstream. Since you asked, I don’t think most Ethernet switches under $1K ‘designed’ for audio yield noticeable improvements if used in conjunction with ENO passive filter. In a setup like yours, ENO should be more than adequate. If I were in your position, I would order ENO Filter and any of the aforementioned devices off Amazon and compare it in your system. And I wouldn’t bother with LPS on your Fios router if you’re using a filter like ENO ahead of N100SC.
If I may inquire. what type of power cords being used with N100 and BP DAC?