[vv_]

It'd be cheaper to buy an RTL-SDR and an LTE antenna than this tinySA. I'm not convinced that a layman would have enough practical experience with radio's to detect these signals though. The bands used for IoT aren't exclusively used for IoT either - they'll contain "normal" LTE signals too.

[blantonl]

RTL-SDRs have a typical usable bandwidth only about 2 MHz, so that is going to rule them out of any real usable LTE related decoding and detection

[vv_]

Channel bandwidth for Cat-M is 1.4 MHz.

You won't be doing any decoding w/ a tinySA either.