Firewall Failover question

[CPRQ]

We have 2 firewalls in 2 data centers; DC1 FW-a DC2 Fw-b; both firewalls need to connect 10+ remote sites to poll data. In this example we use only 3 remote sites RM-A, RM-B, RM-C.  And if Fw-a go down Fw-b should take over. Both data center’s Fw-a and Fw-b has IP connectivity. How we can configure firewalls to connect remote sites and do fail over if active firewall go down? Is it possible if remote sites only support static routes not dynamic routing.