Nodes 12675959510 and 12675959511 are DSLAMs that are mounted on a wall in the garage (one level below ground) of the house. I would like to indicate this using a tag. Just level=-1 is not precise enough, as there are other service rooms in the basement, on the same level as the garage, but which are not part of the garage.
I imagine that saying that something is “in the garage” could be valuable in other scenarios too, for example for EV charging stations, IEDs, shopping cart drop-offs, etc.
I tried my best searching on taginfo.openstreetmap.org and community.openstreetmap.org but could not find clear/explicit information. Thanks for helping me out!