Could you advise me which network diagram is efficient?

Hello all,

I have to configure Router below. (I plan to use HSRP)

I want you to advise me which diagram is efficient.

Actually, I don't know what firewall use Layer mode (L2 or L3) -> this will be confirmed tomorrow.

In this point, if you know well, please let me know yours.

network_diagram.jpeg

Plus, basically, where is firewall located ? 

Maybe should I change router and firewall's location?

Regards,

SK.