There are tons of good gaming cards which have costed like $300 ten years ago and now can be bought for something like $30 for all your trading activity and six monitor stands if needed anyway. Thanks for all that things. How do you plan to proceed ?
Intel NUC will run six 4K monitors. https://www.pcworld.com/article/3267074/intel-hades-canyon-nuc-nuc8i7hvk-review.html
https://www.nvidia.com/en-gb/design-visualization/nvs-graphics-cards/ Nvs 810 will run eight monitors.