I don't have to street park either, and at home I have surveillance cameras that cover my car/driveway. But I like the parking mode for when I run into the super market or home depot, etc. I've had past cars hit in the lot when I'm in a store.

As for the fuses, I was able to use 2 empty ones so I didn't tap into an existing circuit. The fuse taps needed were mini fuse taps. The car uses low profile mini, but Subaru has a tight grouping of fuses to many of the taps dont fit in well. You can either shave down the tap, or just use regular mini fuses. The blades are compatible, it's just a height difference which for our use case doesn't matter.

I wasn't certain what I was going to need fuse wise when installing it so I just bought a multi pack to cover all my bases. I ended up needing 2x mini fuse taps and 2x 5A mini fuses. This is the kit I bought https://www.amazon.com/gp/product/B099JWY2RZ/