I like that there's a tip hazard warning on it. There is no realistic way to tip that thing over without the right tools and/or strong people.

As to where to install it? A concrete slab is really your only option.

If you're serious about a TL15 or TL30 (or want to be a high roller and get a TL30x6), check your area for someone that sells used jewelry safes. You can find them for less than half the cost of buying new. You'll have to build/finish the interior, but that means you can customize it to your exact collection. And forget electronic locks. Stick with a good old mechanical lock.