Shared firewall with multiple customers

Hi everyone,

We run a small datacenter and mostly everything is just L2 and each customer having their own firewall. We do run a shared firewall on a Sophos SG210 running UTM, and each customer having their own VLAN, and we assign them a public ipv4 address which we just NAT to their specfic VLAN, and we not that happy with that solution. So now, we're looking for a firewall that is meant to be used for multiple customers. What kind of firewall would guys suggest as a multitenant firewall?

Thanks!