We have the slim metal box and cable you speak of for the hotrod 2020 stang.
It fits snugly under the seat. We only use it for long trips thru not so CC reciprocally friendly states. Couple times a year. 👍
Nice post and you are correct. Pleasantly surprised by this safe. With space above for quick access. Screws could be shortened by Grinder/Dremel by a skilled fab guy. 😉
Yes, I've had an under the seat model before and that worked ok, but I really like how much easier this one is to access. I don't bend so well to get under the seat anymore.. lol.. Great idea on the dremel. I may try that out once I decide on how to mount it in there solid to keep it consistent. I really like the quick on top out of the safe access so I can easily grab it when exiting vehicle and put it back when inside. Definitely a double thumbs up so far.