<----- semi active firefighter. the sprinklers work best and the dry chems are your best back up fora non sprinler building.. ( don't count me as expert here either only been in fire house since 1996) The 1 draw back to sprinkler is the temps needed to activate them ( about 150 degrees if I remember my school back then) but only work if the system activated.and are also know to fail/ go off for no reason ( specailly if id a dry kept system and freeze if a place gets too cold in winter.) the dry chem portable exst( sorry brain not wanting to spell tonight) are great but require you or someone to be there to use them plus they can loose pressure after a time so needto be checked ( and most can't be recharged)
Now I agree with the gfi, the dual tstats, and the covering of the flexwatt, I also have have wooden racks and have had heat tape melt( burnnig the floor and the cage as it did so) the best trick I seen and like outside of the inspecting of parts was the designing of racks were the heat tape will sit inside a groove and not make much actual contact with the tubs.
I will aslo point out thata gfi can go bad too ( replaced 2 in the almost 20 years My mother had her trailer. )