You cannot use the built-in chassis management SFP port for either FirePOWER logical deivce failover/state or management. That port is for chassis management only (FirePOWER Chassis manager and FX-OS cli shell).
Thus you will need to allocate an interface for each of those purposes. If does burn SFP+ slots and require 10 Gbps transceivers but that's how you have to do it on these platforms.
I usually specify the relatively inexpensive twinax cables for this (and for the connecitons to the switches as well). The SFP-H10GB-CU1M= (or 2M) is only US$100 list price and covers both ends of the connection. Contrast that with a SFP-10G-SR-S= fiber transceiver where you need two each plus a fiber jumper per connection.
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The Cisco Secure Firewall and SecureX teams are looking for feedback from active Secure Firewall users who may or may not have already activated SecureX. Your responses will help us improve the Firepower experience in SecureX. Th...