4G compact solution comparable to Netgear Nighthawk M1

Hi everyone,
I'm new to open source routing and need a hand formulating a solution. Currently I'm working on a project which requires transmitting data from an ESP controller and livestreamed two cameras via 4G. At the moment we are using Netgear Nighthawk M1 but they are too expensive and don't offer the control we need.

Could I please get recommendations for an open source compatible platform which is compact, affordable and provides comparable performance to the nighthawk M1/M2. Also, we are situated in Australia and want to use Telstra as the service provider, so any information regarding the permissions needed to use their network would be excellent.

Thanks for any contribution