Adding a switched circuit from the fuse box

[CrazedCat 10+ year member]

I want to add an ignition switched accessory wire from the fuse box (I'd rather not tap into the cigarette lighter). Apparently I have to bypass the Metra wiring harness for my jeep because there was a bad batch that caused the h/u to turn on and off at random. So I have to direct wire the 12v ignition/acc. Anyone have experience with these "add-a-circuit" fuseholders? I'll plug this into a hot switched open fuse terminal:

Is this the safe way to go or is there a better solution?

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[starkfu 10+ year member]

solder onto the switched lead in the ignition harness under the steering column, would be the best way.