Configure one RUT240 router in accordance with your needs. Then go to the System → Administration → Backup page and download the Backup archive. (more info here).
You can then upload the Backup archive to your other routers and their configurations will be identical.
However, you will have to set the static IP and password for each router separately.
You can change the password from the System → Administration → General page. Or if you prefer SSH, you can use the passwd command to change the router's password.
When you say static IP, do you mean LAN IP or WAN IP?
- LAN IP can be set in the Network → LAN page.
- WAN IP can be set in the Network → WAN page, by clicking the "Edit" button next to Wired WAN. In the next page, set protocol to "Static" and set up your IP.