You will use SIM SLOT inside RouterBoard.
m.2 adapters must be a B-Key, for LTE modules, many of them have a SIM SLOT, good to have it bottom site, that with Sim slot on Module site must be unsoldered !.
HEAT should be controlled ! by AT Command you can read it, if it's hot then disable CA and next step is to disable interface.
I hope MikroTik can create for us a perfect m.2 adapter with heat dissipation :) .
Common problem at picture's:
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