Hello,
Unfortunately, having several RUT devices within the same network will not help you to increase throughput for a single established connection, as Teltonika devices do not support traffic bonding without additional services by third parties, for example, Bondix.
However, RUT devices support several WAN interfaces, operating at the same time with Load Balancing enabled, meaning that another RUT can be a wired or wireless WAN source for some primary RUT device. In this configuration, primary device has more resources to support an increased number of simultaneous connections or allow more traffic for current connections by distributing traffic between different interfaces.
Best regards,