The robot platform is the MCU model that will be used. There are several MCU platforms that you use for a multi-robot implementation. Arduino, Raspberry Pi, ESP8266, ESP32, TI LaunchPad, and BeagleBone are samples of MCU platforms that can probably be applied for your case.

Sometimes, you may nee to consider the price parameter to decide upon a robot platform. Some researchers and makers make their robot devices with minimum hardware to get optimized functionalities. They also share their hardware and software designs. I recommend you visit Open Robotics, https://www.osrfoundation.org, to explore robot projects that might fit your problem.

Alternatively, you can consider using robot kits. Using a kit means you don't need to solder electronic components. It is ready to use. You can find robot kits in online stores such as Pololu (https://www.pololu.com), SparkFun (https://www.sparkfun.com), DFRobot (https://www.dfrobot.com), and Makeblock (http://www.makeblock.com).

You can see my robots from Pololu and DFRobot here: