Yes. You may have multiple nodes behind a single IP address, but it doesn't necessarily mean that you increase the chance of earning more rewards.
Yes, you need a static IP address to run a node. In most cases, you'll have to configure your router's port forwarding rules. A static IP address gives a fixed address to your computer on the local network at your business. Port forwarding is used by computers on the Internet to connect to a specific device on your internal network. To set up port forwarding, you must assign specific ports or a range of ports to a particular IP address.
You get a static IP address from your ISP (internet service provider), or the easier option is to run the node on a VPS (virtual private server) with a static IP.
The current requirements are:
2 CPU cores
8 GB memory
256 GB disk
The guide to help you get started with the node-client software is published here. We will notify you when the public node client is released if you've signed up to our mailing list. Rest assured, nodes will be easy to set up.
No, Radix doesn't require any tokens to host a node.
There’s a private Test network on https://explorer.radixdlt.com/, but no public testnet yet. There will be open developer betas in the near future though, so we suggest signing up for the mailing list.