| you should be fine with it like that. i have never had a problem with my heaters touching glass or acrylic
one recommendation, while i do like the visa-therm stealth heaters, i found that the dials are sometimes off, so make sure you are keeping an eye on the temp.. what i mean is that you may find the dial to be off my 2 or 3 degrees, so if you set it at 80, it might come out to 78-82, just make sure you find the variance and set accordingly. so if you see its low by 2 degrees, and setting to 80 puts your tank at 82, just set the dial to 78 to maintain 80... hope that makes sense.
i have had any further inaccuracy or stability issues with them, so once set, you should be fine
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