System Requirements for a Solarwinds Pack

Hi all guys!

I hope someone can guide me with this. We have an upcoming deployment of the following Solarwinds modules:

• SolarWinds Network Performance Monitor - SL500
• SolarWinds NetFlow Traffic Analyzer Module for SolarWinds Network Performance Monitor - SL500
• SolarWinds User Device Tracker - UT2500 (up to 2500 ports)

1. I know that each module has it's own system requirements (CPU, Hard Drive, RAM). But what happens if i want to install all of them together (NPM + NTA main poller + UDT) in the same Virtual Machine. What are the "best practices" or official documentation in this case? or i just have to use the sum of RAM, Hard Drive, etc etc for an optimal perfomance?
2. Also, is there any special requeriments for Virtual Machines in this case?

Thanks in advance