Rottner Comsafe Opinions?

Never heard of them. Looks rather small. Difficult to judge size from the photo though. Looks really tuff. Also, looks expensive.

The seller doesn't know his product well enough to answer basic questions and the product info section of the manufacturer's website is in German.
If I was shopping for a safe, I think I might feel better with a dealer who could answer questions and product info that was in English.

For any small safe such as this one, I would be inclined to hide it by putting a cardboard box over it.
A little extra security for zero extra cost.

I think the plug in the center might be access for bolt-down. One 20mm though-bolt would be enough.

Rottner makes nice stuff (from my research) but this model is no longer listed and they don't fire-certify all their products. Without that knowledge, I'd frankly leave this one alone. Another consideration to me is what looks like electronic-only access - what happens when that stuff gets melted in a fire? What if a battery goes funny and zaps a chip on the logic board? I am really no fan of electronic safes, especially when they don't have keyed backup.