Sorry gents, those epirbs won't survive the crash in the first place.
I hear where you are comming from, but neither you or I know this about any particular crash with 100% certainty.
Accidents are chaotic.
Installing a large number of devices hoping one will survive is not an unreasonable approach. I say this from a backgound of installing cameras in explosive environments, including three aircraft frames that were destroyed.
In any event if an aircraft so fitted goes missing without further contact it serves to reinforce the prospect that passenger survival is remote, which adresses the context of my original post relating to relatives of passengers and crew.