There are a couple of ways to address the speedtest question:

1. You could add speedtest.net as a managed device

2. If you’re cool with docker you could get speedtest-cli from gists and install the docker container, failover to cellular, run the ephimeral docker

3. Iperf could be used by dropping into the shell and running iperf commands after failing the unit over to LTE or making LTE (or whatever other connection you want to test) the primary connection - https://support.zpesystems.com/portal/en/kb/articles/nodegrid-sr-net-ports-performance

 For reporting on cellular you can use this - https://docs.zpesystems.com/docs/wireless-modem-sub-tab?highlight=modem

 And for extension antennas and boosters, as long as it’s the same connection type it should work.