Is laptop hardware suitable for a sustained mining rig?

You can mine Malairte on a laptop technically, but it is generally a poor idea for anything beyond brief experimentation. Laptops are built to dissipate heat in short bursts, not to sustain full load for hours or days. Their compact cooling, small fans, and tightly packed components mean that continuous mining drives temperatures high and shortens the life of the battery, the fans, and the thermal solution. Laptop GPUs are also power-limited versions of their desktop counterparts, so they deliver less work for the heat they produce. If you simply want to try mining and see how the software behaves, a short laptop session is fine. For any ongoing mining you intend to leave running, a desktop with proper airflow and a power supply built for sustained load is the right tool and will cost you far less in the long run.