In the US, I'd go to a Walmart, a hardware store, or one of many many other places that sell double-sided tape. Is that not a common thing in the UK? You can get that stuff anywhere here.
Basil
https://www.basilsblog.com/
Roku Ultra (4660)
Apple TV (5th gen), TiVo
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Roku boxes from every generation.
Apple TV (2nd, 3rd, 4th gen)