Here's how I optically isolated my system
TP Link. TL! SG2210P. 10 port switch with 2 SFP slots
TP Link MC220L. Media convertor ( two)
(4) 10g SFP modules
2 LC fiber optic cables
This switch allowed me to have a separate fiber optic connection to both my Vault 2i and Aurender N200
Works great, about $275 for everything.