Your best bet is to use several computers that has headroom for future use aswell.

If you can afford this kind of hardware to begin with, we are talking per 8 accounts ("per battlenet account"): if it was me: 64gb ram, amd 3950x, radeon vii 16gb vram gpu, 1-2gb m.2 ssd 2000gb/s+, two monitors. Etc.