how to config zabbix proxy and remote hosts monitor correctly?

[ioiioi]

I am newbie to zabbix, has a few question of zabbix li
there are some remote servers on the other side of city, so I would like to utilize zabbix proxy to easy deployment.

the topology look like this::

1.1.1.1:firewall:192.168.1.1<----switch--->192.168.1.2:zabbix-proxy
                                    |
                                    |----->192.168.1.3:remote-Host1
                                    |
                                    +----->192.168.1.4:remote-Host2

I have create a portforward rules on firewall:

1.1.1.1:10051 <-----> 192.168.1.2:10051

so, the zabbix server could reach zabbix-proxy's listen port.

questions:
1. do I have to install zabbix-agent on the zabbix-proxy in order to monitor by zabbix server?

2. when create remote-host1 on zabbix-server, what ip address should be config for remote-host1, is it 192.168.1.3?