You're going to be stationary so being wired isn't a big deal. I think I did see the second one under the keyboard as well.
You'd need a mpcie to pcie x16 adapter, psu, gpu, monitor and since you have to take off your keyboard, you need one of those. The popular adapter has been the exp gdc but prices have been going up and you can find cheaper, better generic ones.
https://www.ebay.com/itm/222367957172 Be aware mpcie is only x1 which can bottleneck the gpu to up to half the performance. Usually it's not that bad and just about any gpu will get more performance than that intel igpu anyways.