The 6th generation Hyundai Sonata is known as the i45 in New Zealand. It comes with a factory transponder immobiliser and key-less entry. If you want a decent alarm then a OEM upgrade is the obvious way to go.
Cobra AK4615 in PLIP Mode
If you are looking to improve on the factory alarm then I highly recommend the Cobra AK4615. Whilst the i45 is not listed for CAN-BUS software it is still possible to install it in PLIP mode. If I have PLIP in brackets next to the model on the CAN-BUS vehicle listing page it indicates that it can still be installed without any issues.
Here is a quick video of the AK4615 in action in the i45.
Here are some photos of what you’ll see after the install:
The AK4615 also works with the previous generation Sonata NF (2004-2009) which also comes with factory keyless entry.