As said above, there are hardwire kits available and they should have an auto cut out when the battery drops below a Set voltage (usually 11V iirc) so that, if left for an extended period, you can still start the car.
I got mine from Amazon and often kits come with each type of fuse and piggyback adaptor as a universal kit. I can’t remember which fuse I used but I went along with a multimeter when the ignition was off testing each fuse till I found one with 12V across it.
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