My home builder gave me cat5e outlets in the wall (near the ceiling, for cameras) with just a plain white wall plate. Behind the wall plate is an open back wall box (I think), the cat5e cable and a whole lot of insulation (the pink puff balls kind that go between walls to retain heat). I replaced the wall plate with this https://www.amazon.com/gp/product/B00DL93SLU
I heard somewhere that all holes in the wall with wires/plumbing coming out should be closed with fire insulation foam. Should I get some fire foam and seal it up? Or should I replace the open back wall plate with a close box? Or do I replace the wall plate I have and install an ethernet interface?