In my setup, two wan routers are connected to four WAN links, two from one ISP and remaining two from other ISP. I have configured by routers using glbp and a firewall and a few switches are sitting in between my clients and wan Routers. From firewall, all my traffic is going out via one router only and I don't think any load balancing is taking place. I have not tried trace from my clients. And I can't provide the glbp virtual ip as gateway in my client machines. So would the traffic from my clients to wan be load balanced by glbp ? From firewall, it's not being load balanced and using one router only.
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In your case, if a FW is the L2 "client" seen by the routers, your routers will only have one MAC address client and GLBP will not load balance.
If your WAN links are about the same bandwidth, and if your FW supports static routing, you could use two mHSRP virtual gateway IPs and load balance.
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