We were a group of 4 people with 10 devices and only 2 of us made it far enough in the queue to get in. We ended up getting the tickets not with the first device that came in but with the second one.
Things that might help you on Sunday:
The two devices we used to get in were two phones with mobile data, and on both we refreshed the site when there were 3 seconds left on the countdown.
So my main recommendation is not to wait for the countdown to end and automatically get in the queue, refresh the page and you will get in the queue sooner. We did the same for the Oasis tickets and also got them.
Once inside, despite the message that they were sold out, I managed to refresh the page and enter my card details. So make sure you try until the last minute.
In the end we got tickets for Thursday instead of Wednesday, which is not ideal, but at least we have secured tickets, which was de goal. Now, we just have to book the flights to England and figure out how to get a camping pitch when we arrive on Thursday 😅 Any advice is welcome.