Don't want to mount to your HVAC unit using screws? Use magnets instead! Print two of these to mount to the top and bottom of the device.

Requires:

• M5x6mm (x6) Hex head cap screws
• 18x5mm (x4) round magnets (neodymium recommended)
• If your magnets are not 5mm tall, you can glue in a spacer.
• It should be a very tight fit (i had to tap them into the hole with a hammer), so no glue may be needed. Otherwise superglue or epoxy will work.