Am I right in thinking that since this can measure 16A, it could theoretically be mounted directly after the fuse in the fuse box and thus measure the entire circuit? Has anyone done this or just hung them behind dedicated sockets?
What else I've read is that the radiator was subsequently defrosted due to a fault? Probably only recommended with a relay contact where no "critical" devices are connected?

Question

Am I right in thinking that since this can measure 16A, it could theoretically be mounted directly after the fuse in the fuse box and thus measure the entire circuit? Has anyone done this or just hung them behind dedicated sockets? 
What else I've read is that the radiator was subsequently defrosted due to a fault? Probably only recommended with a relay contact where no "critical" devices are connected?

Answer

You can also insert it directly behind the fuse. It doesn't really matter where in the cable. However, please note that neither terminals nor devices (such as this Shelly) may lie loose in the fuse box or meter cabinet, but must be fixed (on the top-hat rail). Since the measurement also brings a component (a shunt; very small resistance) into the circuit, the device behind it could also fail if this component fails...

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