Usually I put the probe so it's covered by a corner of the UTH, which leaves most of the UTH in contact with the glass.
As suggested set the t-stat so at the very hottest points the glass is reading 93*F. The reading will be lower where the probe is between the UTH and the glass, that's ok. Also, no UTH or heat tape is constant over every inch, I've found variations of +/- 3*F on most of mine. As long as the heat is in the 88-93*F range on the glass where your BP can lie under the hot side hide, it'll be fine.
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