3M VHB™ double-sided foam tape is the strongest in the world, with nothing else coming close. On eBay or Amazon this tape normally costs about £10. Other similar 3m tape rolls on 3M Direct cost £12. Discount code GOODWOOD10 gives 10% off + free delivery (you normally need to spend more than £30 to get free delivery).
I've bought it to permanently fix my car dash-cam to the windscreen because the suction pad keeps falling off when in direct sunlight.
This professional, high temperature resistance, 3M VHB™ tape can withstand temperatures even higher than 200°C and still keep a strong hold (for a limited time at extreme temperatures)... But of course, it's still general purpose double sided tape, and I'm sure I'll find many other uses for it, so I've ordered 2 rolls while it's this cheap!
KINGYFUN (post #3): Also topcashback of 8%