There usually is a bit of tolerance in such specs to accommodate for inaccuracy of thermometers but at or near 100ºF is the max operational temp of most flexwatt. The question in my mind has two answers. The most convent is clearly flexwatt but I would not say the safest.
Flexwatt is a great product but it does get quite hot, I always run a max temp test to see (carefully monitored) what the max is I stopped my flexwatt in the 160º range and it was still climbing at that point. Not safe maxed out at all, it is hot enough to actually do damage to itself why the manufacturer states it must always be regulated. I would not use flexwatt with out a failsafe ever. It also is as safe as the person doing the wiring. If someone with knowledge and skill does it it is safer than someone whom has never done it before. In Canada if you are a business to be legal it must be done by an electrician this starts to question the convenience a lot.
For safety there are a number of lower density heaters on the market that have restricted voltage and or wattage they simply do not get super hot ever. Ultratherm, intellitemp, exoterra rainforest are a few I know of. (I dislike the exoterras but...) I have exoterra and ultratherms they in the same max temp tests both hit around 100º and stopped and held this for ages. This would be the safest even in the event of a T-stat failure there is not much worry as 100ºF is not going to cause permeant harm to the snakes and not going to damage the UTH or rack. This IMO is the safest but not very easy. If 100ºF is not hot enough to hold correct temps the room is too cool.
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