To obtain what you want, you will probably need to do a small amount of building. You will probably need to purchase a 17" i7 laptop, install a 2x8GB or 1x16GB RAM stick, pull the HDD and install a 1 or 2 TB SSD. You don't need to have a laptop with both an SSD and HDD. It just runs down the battery quicker anyway. I looked at the
Asus laptop and the SSD is only 256 GB. I don't know if you want to pull the cover for a different laptop and work on it.
For the 4-5 DOM's, what you want is 1-2 portable USB3.0 screens, protected by cushioned slip-on cases, and a good backpack for portability.
Here is my post I wrote last year which covers this.
If you want to quickly get into trading without any building, that
Asus ROG laptop or something similar is OK. It also has an nVidia 1060 GPU. You can use nVidia GPU's to experiment with CUDA (GPU) programming if you ever wish to. Perhaps the more advanced trading platforms will be CUDA enabled in the future. Don't expect long battery run times on these large performance laptops.
As for overheating, if a laptop overheats, it could be the manufacturer did not apply enough, or good enough quality, thermal compound. Perhaps the worker did not apply it correctly. IMHO,
Arctic Silver 5 is still the best. Perhaps the fan, usually the most undependable part of a system, was malfunctioning. IMHO, manufacturers usually do not apply enough oil or grease for fans. Sometimes manufacturers do not apply
any oil or grease to the fans, usually cheaper sleeve-bearing, and they fail within 2 years.
IMHO, even a sleeve-bearing fan, properly greased, should operate for tens of thousands of hours.
Whatever you buy, be sure to do your research and read the reviews.