The MoT test only seems to worry about obstructions or damage to the windscreen. It's apparently OK to reduce the transmission of the side windows by darkened glass. But the stylists have spent the last 20 years reducing the rearward glass area on most cars, so stickers or the like won't help there.
Personally I would just avoid putting them over any demisting elements in the rear window, or in the direct line of your r-v-m.
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