Stanley Closers Comp. PS490 24 Volt DC .5 Amp Power Supply
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If you're going to use the optional Stanley Closers PS490 24 Volt DC .5 Amp Power Supply which is referred to on page 1-6 of the above link, I would imagine that you don't have power that close to the operator that you can extend the transformer and its power supply leads to that outlet where you can unplug it in - as a result of that I would imagine you would not attempt to install it into the header although it might be close enough where you can install it partially into the header assuming you have room to do so.