It depends on the refresh rate you need.
The current version of the system uses an i2c bus to communicate btw sensors, which has a limited bandwidth.
You can connect up to 30 nodes and gt a refresh rate up to 65Hz for each. Take a look at this answer.
The i2c bus will be dropped on following versions, instead a more robust and fast bus will be used, allowing for a higher refresh rate, even with many nodes.