If the software opens but shows "No signal" or -- values, the installation succeeded, but the driver mode failed. The modem is likely presenting itself as a CDC ECM (Ethernet) device without a companion serial interface.
The Raspberry Pi is an excellent low-power platform for running LTE H-Monitor continuously. Since the software works with Mono, it can run on Raspberry Pi OS without issues. Many users in the community utilize LTE H-Monitor on Raspberry Pi primarily for managing band aggregation and connection stability. lte hmonitor install