I bought a couple of the GunVault products. I keep one in my vehicle, and one in my wife's vehicle. I also use them when flying, or when not staying in my home. They are at a good price point, pretty versatile, come with the cable for securing them to a secure object, and can serve multiple uses.
When using them in a vehicle, I keep them with me in the front seat, disarm, then lock them in the trunk. They are jsut a small black box, so they don't draw a lot of attention moving them from the cabin to the trunk or vice versa.