I'd be surprised if there wasn't issues, with everywhere going live at 8am it should spread the load out a little, rather than the PS5 release of pre-orders which had basically tens of thousands of people smashing each website until they ran out, then the next one to release stock, until each site had sold out within 20 minutes.
But on the downside, everyone knows when pre-orders are going live, so expect a mad rush at 8am.
There was a 35000+ queue of people just trying top open the currys pre-order page at one point.