Certainly, safe deposit boxes are the number one target of robbers, along with your electronic devices, thus, in case of a robbery, you're practically losing access both to your computer and your backup phrase.
The safest bet is as I mentioned, a drawer or a compartment in a bedside stand, clothe closet, something that doesn't stand out, along with multiple copies.
I think that it is easier to steal stuff from my home than from banks vault. And the same thing goes with fire destroying the building.
Oh excuse me, I didn't notice we were talking about bank deposit boxes, I dun goofed. I thought we were discussing having a safe box at tome, in which case, my previous reply could possibly be a possibility. Bank deposit boxes are deemed safe, only specific people have access to their storage, while even the bank doesn't know its contents.