Hi,
I would like to know more details about this project. how many IP addresses? what services are related to those IPs? I could offer you a vulnerability detection test where I follow international standards like OSSTMM, ISO 27001, OWASP, and The penetration testing execution standard (PTES). Then I use the top best software to detect vulnerabilities automatically and at the end I go manually looking for vulnerabilities in services, ports and applications involved.
I will provide you with a technical report with the description of each possible vulnerability detected, the impact of each vulnerability, the way to exploit them and the best recommendations about how to fix those vulnerabilities.
In the report I will explain if the server needs an specific patch, or if you need to upgrade a service app. Among some general tips a tricks to improve the security of your systems.
Feel free to take a look at my profile and reviews and contact me anytime.