That was just an example from Amazon, there are a ton of different models, different price ranges. I see specs on some that suggest they work in all kinds of weather... the video I put up is a V8 Camaro , other videos with folks using them on older big block V8's, people using them on RV's. Of course you need to be careful on which one you go with, lots of cheap stuff out there.
https://www.amazon.com/remote-batter...+switch&page=2
The amperage rating doesn't seem to be a problem although I hear what your saying, there are some on Amazon that say they can handle 1000A of cold crank.
The remote issue could be a problem, no doubt as they aren't likely sophisticated rolling codes but nothing is perfect. For me this would be used just occasionally when the car is in a overnight situation away from home. I'm in Canada and store the car in the winter.
With the battery in the trunk this will present a problem for the typical car thief, where to look if the car doesn't respond? Just easier to move on. Nothing is going to stop a professional thief.
Was hoping someone on the forum would have some experience with them, even paying $200+ for one that works well would be a deal compared to some of the solutions like the Ravelco. Lot of what you choose to go with depends on where you are, what your car is exposed to so far as a theft threat. I get that.