Can a Firewall be deployed on a L2 device defined Network?

I have just started my new job as a network engineer and have come across an unusual request

I have an L2 network defined, the LAN is behind a Layer 2 switch, which is then connected to the WAN/MPLS router. I wish to deploy a firewall in this network.

Will the following setup work: LAN---L2 Switch---Firewall---ISP

Please note that L2 switch is not just connected to the LAN, it is also connected to a WAN Router to reach out to MPLS network as well. How to deploy this?

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