Install Loraffe Rodent Repeller under hood to 12V fuse box

Hi everyone. I've searched and not found any details on this, or on YouTube. I live in an area with a lot of rodents, and I've caught 3 mice in the cab of my car (little buggers). So I have purchased the Loraffe Rodent Repeller on Amazon, and it has great reviews. It needs to be hooked up to the battery, but the battery is in the trunk area on the right rear. I did some searching, and I'm wondering if this rodent repeller can be wired to the 12V fuse box in the engine compartment, because the engine area is where it needs to do the beeping and flashing the lights. Does anyone have any details on this, particularly an install video, for me to put this in?

While I'm asking....do you recommend installing one of these, two of these, or installing them in the rear, too? I've read that rodents can be a real problem with Prius vehicles due to the soy based wire wrappings, and since I have a known mouse problem I better take it seriously since I just moved into this neighborhood 2 months ago and have already had 3 mice caught. Others on other forums recommended doing an anti-rust treatment for the undercarriage or the engine, which makes those soy wires less tasty. Can you give me your thoughts and experience? Thanks! I appreciate all comments!