With what you have described I would lean towards flexwatt. You could run one length of flexwatt along the bottom/back side and control all three enclosures with one T-stat.
Check out these sites:
http://www.spyderrobotics.com/products/index.html
http://www.bigappleherp.com/Flex-Watt-Heat-Tape
The Herpstats are expensive but well worth the money. You can however find cheaper T-Stats.
***Tony S.***
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