I'm planning the same strategy. Refresh safari, force close iPad, leave phone.From my experience, I seem to get on quicker on safari via my MacBook. However, I will literally have my Mac, iPad and iPhone ready.
I have also force closed the app and don’t think it’s an issue.
I will have my Mac ready to refresh, iPad to force close and my iPhone which I’ll just leave to refresh on its own.
I have also gone for 0% finance as I always seem to get issues when paying via card or Apple Pay, and I have to ring my bank to authorise it and delays the order.
I'll be paying with gift cards (-5% discounted rate via employer) which I have already credited to my account in advance. A bit scary to see a balance of £1,399 on there, I must admit. Did the same 2 years ago and it went fine. Doesn't save a fortune but I'll take what I can get.