Power and Maintenance - markmac99/ukmon-pitools GitHub Wiki
Generally no. The pi is most likely to fail during poweron and off, and switching the Pi off without properly shutting down the software can corrupt the SD card.
Though its not essentiaial, its a good idea especially if you live in an area where you experience power outages. Its not critical though.
Definitely. During data capture the pi will get really hot. Once CPU temperature exceeds 85C, the pi will slow down and data capture will be damaged leading to lost frames, double-imaging and unusable data.
Lofts are a bad idea as they are hot and dusty, and the Pi won't like that. A shed should be ok as long as it is dry and animals or insects can't get into the Pi's case. A spider or mouse nest would be bad.