Will Dual WAN conflict with hardware firewall?

I want to get a Dual Wan and it looks like they come with a firewall. I already have a Linksys Broadband Firewall Router that I am happy with.

Can I plug the Linksys into the Dual Wan or should I just use the Dual Wan? Is two firewalls better... or not needed... or conflicting?

Any help appreciated.
 
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