I use a single port version of this with SFP+ modules. Intel X520 equivalent.
They also make versions that don't require the SFP+ modules.
I installed an Intel X520-DA2 based card and am using it w/ Untangle w/o any problems.
This card:
https://www.amazon.com/gp/product/B01DCZCA3O/ref=ppx_yo_dt_b_asin_title_o09_s01?ie=UTF8&th=1
With this adapter for my FIOS ONT:
https://www.amazon.com/gp/product/B01N1273PI/ref=ppx_yo_dt_b_asin_title_o09_s01?ie=UTF8&th=1
And this going to my Ubiquiti switch:
https://www.amazon.com/gp/product/B00SWD0318/ref=ppx_yo_dt_b_asin_title_o09_s01?ie=UTF8&th=1
I have no problems pulling 2.3/ 2.5gbps down/up with app control, firewall, threat prevention & intrusion prevention turned on.
This card worked great https://www.amazon.com/dp/B01DCZCA3O?ref=ppx_pop_mob_ap_share