welcome to Nimble Connect!
The Installation Guide is probably the best way to start. Subnet sections starts at page 9.
You need an InfoSight account to have access to that document.
Always feel free to call our Support. They can help you with these kind of questions too.
I see that your based out of the US, this is the toll free number: 1-877-364-6253
I can also send you the contact details of the SE who covers your region.
If you wish me to do so, please send me a PM.