The Seeker has been used for that sort of work in the past, though the customer is still expected to develop the swarming application. You can see this article here as an example.
The configuration of Seeker depends on how the customer intends to approach the problem. If you plan to communicate with the robots over cellular / LTE, then that is the option to choose. There is WiFi built in for short range communications.
A controller is recommended for emergency take-over, but not explicitly required. Please develop using extreme caution as unpredictable behavior can occur. We have some safety tips at https://modalai.com/safety