Redundancy router for 2 ISP

We have 2 ISP2s each with its own router and connection to redundancy router TP-Link VPN TL-ER6120. Before I brake anything, can I connect Firewalla Gold to Redundancy router in simple mode? Will it find and manage (protect) ISP 1 and ISP2?

I already connected Firewalla to one of the routers directly in simple mode, just to learn, should I reset firewalla before connecting it to redundancy router?

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