Hide is used to "overload" single IP for outbound traffic.
Static is used for inbound connections to the servers you are hosting.
If you have a number of public IPs and you are hosting a server behind the gateway that the external clients must connect to, you use Static NAT.
I.e.: You have 184.108.40.206/24 public range, your gateway is 220.127.116.11, your internal network is 10.0.0.0/24 and your DMZ is 192.168.255.0/24.
You configure Web server in DMZ with IP of 192.168.255.2 and Statically NAT it to 18.104.22.168.
Your internal network 10.0.0.0/24 is Hiding behind gateway's IP of 22.214.171.124.
Inbound traffic to your web server will be translated to its private IP address 192.168.255.2.