SRX as Firewall Gateway Route mode

Hi,

 We are looking at this model SRX550 and SRX1400 for our small-medium size OpenStack data center.

 We want to find out this model can be configured as the following setup

Public IP  range

Example 123.0.0.0 / 24

Gateway : 123.0.0.1

Configure as route mode instead of NAT

ISP ---- SRX-xxx (123.0.0.1) ---  Server with public ip  123.0.0.0/24

Firewall protection

1) DoS and DDoS attacks

2) ACL port access on certain public ip

VPN Access for administration

Thank you.