A:AnswerIf you are buying your computers based on the number of cores, buy a computer with an AMD EPYC (Max 128 Cores). Of course, you won't find this on a laptop.
A:AnswerYes, but only just. As I advised the guy wanting to run OBS, you don't know enough about what you are doing to start using this software. The slightest problem will stump you and make you want to throw your laptop against a wall.
A:AnswerYou will probably need to go through the SteamVR ecosystem, at the very least. But there are too many variables to go into here. You need to narrow down what you are doing and what your approach is.