Do armored pre-terminated fiber allow grounding provisions? The ones I've seen have the armor encased in a jacket. For the home I would prefer and ran pre-terminated.
https://www.commscope.com/globalassets/digizuite/182376-p360-ukgmpmpdf-comprehensiveexternal.pdf
Just run 3/4" PVC and install riser rated from fs.com.
2 controllers and PLX switch.
Some switches provide flexibility in how you can mount their ears so the switch can stick out more in order to fit rack constraints.
A more pricey switch like the Arista DCX-7060CX-32s has a depth of only 16". A lot of Aristas are shallow depth. Mellanox switches could in theory be as shallow but it looks like the depth is dictated by their PSUs.
Check out https://forums.servethehome.com/index.php?threads/sfp-cards-with-aspm-support.36817/page-2 to find out how to enable ASPM on ConnectX-3s.
powertop shows the card reaches C6 in my Z620 running Proxmox.