Would probably be ok with a quad core cpu made in the last 5 or so years or higher, 8 gigs of ram and something like a geforce 1050 or better. It doesn't take too much to run eq. Make sure to use an ssd or nmve to play eq from, especially if you are going to have logs going on all of the accounts. If you can afford it, look for something more like 6 or 8 cores and 16 gigs of ram.
I do 12 on live and 54 on EMU with 64GB Ram, AMD Ryzen3950 and 2080TI. Shouldn't need to much for 6 but I also wouldn't turn graphics on high on any but the main character you play, so their BG FPS stays as high as possible.
32 Gig Ram, AMD 3950 with a 2080ti, and I have run 15 on live with full effects with zero issues. While that is going I have been known to pull off a full game or world of warships or WoW with no real performance issues. Any good multicore cpu in the last couple of years, and you are going to be fine. EQ does not tax a modern graphics card at all, even at 4k res. cpu = Memory > Video Card. If your cpu is older, go with more memory. Any Iris powered Intel CPU will do fine for 6 as well.