Proxy ARP

Hi,
I would set static proxy-arp replies in Mikrotik router.

This is needed because I have some NATted hosts and I wouldn’t to add all public IP to public interface of the router, if I can set a static proxy-arp reply (like 192.168.90.0/28 → a certain MAC address) which a single rule I can manage all NATted devices.

Obviously for each device I have to set a firewall rule to map public to private IP, but I would avoid to add the public IP to the router interface

Anyone knowsif this is possible orif there is a better solution to accomplish teh task?

TIA

Can you explain this scenario with a scheme?

A.