HDPlex H5 Fanless HTPC Classis Installation Manual page 13

If you are using HDPLEX 400W NanoATX Combo power supply, we recommend
using 2x25mm length copper stud to form 50mm high post install the HDD rack.
You could install two SSD and one 3.5" HDD on top of 400W DC-ATX converter
and two SSD on top of 400W AC-DC adapter with HDD rack reversed.
If you have a long video card or is using H5.TODD, you could double stack the
second HDD rack with 3.5HDD on top of the first rack using 10mm copper stud.
If you are using ITX motherboard, you can install the second HDD rack on the
side position.
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