I can 100% guarantee the plastic will NOT melt. I have the same exact terrarium and I use the same CHE and I was also worried about the same thing, but just to be safe I covered the plastic bars in aluminum foil tape (Which is heat resistant), but either way it will not melt.
No need to worry. Just use that tape to cover the plastic and place the lamp right on top. The CHE bulb will not touch the bars because it's smaller, so the only thing that will is the edge rim of the lamp. No need to worry about that as it doesn't even get nearly as hot as the CHE bulb too.
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