Hello Aidan,
The topology will look like this: ISP 1, located on DC1, connected to a core switch in VLAN X which in turn will connect to port X of FW1. ISP 2, located on DC2, connected to a core switch on the VLAN Y which in turn will connect to the FW2's X port. These switches are stacked, that is, they are part of the same "unit". In this way, what is the best approach for both ISPs to be connected, whether redundant or active?
Firewalls in active/standby mode or active/active ?
And about configuration of rules, NATs, static routes ?
Thanks.