What after-market security alarm do you recommend for 2021 GT (Auto trans)?

[Sticky Burner]

I'm wanting to install an aftermarket alarm, but so far, the techs at Car Toys (Dallas) told me that it would cost three times the normal amount because of all the modifications, wiring, etc. Which one are you using and recommend? ( I don't need a remote start, just a good alarm that works well with a 2021 Mustang GT.

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[billzkey]

I was always a Viper or Clifford Matrix type of person, but the interface modules can get expensive to add one of those alarms to a modern day vehicle. In fact, I no longer have the ability to look up just what modules are needed. Grr...