It is possible for laptop manufacturers to include desktop versions of Nvidia’s RTX GPUs in laptops, but it is not very common due to the design constraints and thermal limitations of laptops.
Desktop GPUs, like the Nvidia RTX series, typically consume more power and generate more heat than mobile versions, making them less suitable for laptops. Laptops are designed to be portable, and they have more limited space, power, and cooling capabilities compared to desktop computers. Because of this, laptop manufacturers often opt to use mobile versions of GPUs specifically designed for use in laptops, which consume less power and generate less heat.
In addition, it is not only the thermal challenge but also the size and power consumption concerns, the use of a desktop version of GPUs would make laptops bulkier and require bigger battery capacity, which would also result in less performance per watt.
That being said, some gaming laptops and mobile workstations have been released with desktop-class Nvidia RTX GPUs. Still, they tend to be large, heavy, and expensive devices that are intended for use by gamers and professionals who need the highest possible performance in a portable form factor.
It would be more likely to find this kind of configuration in a larger format notebook with better thermals and power supply, such as the Alienware Area-51m, Asus ROG G752, or the MSI GT80 Titan.
It is possible that enabling the integrated graphics on your motherboard and using the HDMI port to connect a fifth monitor could disrupt your NVIDIA Surround configuration. This is because the NVIDIA Surround feature is a software feature that is managed by the NVIDIA driver, and when you enable the integrated graphics, the driver may switch to using the integrated graphics instead of the RTX2070S GPU. This could cause issues with the Surround configuration, as the software may not be able to control the multiple monitors in the way that it expects.
Additionally, some motherboards only allow one graphics device to be active at a time and switching between them may also break the configuration.
It’s recommendable to check your motherboard and GPU’s manual/documentation to confirm if this configuration is supported, if not, you could use the fifth monitor in extended desktop mode, which would allow you to use it in conjunction with the four monitors you have in the NVIDIA Surround setup.