In a way they are, but you also have to make them so that applying the 200-300 lbs pressure on the TEC wont make the wb base bend and hence make bad contact with the TEC.
Personnally, I believe that a #rotor style block with a relatively thick base will do a good job at cooling a TEC. Also, using more than 4 screws to tight the wb/TEC/coldplate assembly together might help having a more uniform pressure/contact.
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