This memorial tablet is called "ancestral memorial tablet", and the merit memorial tablet is donated to the temple.
As you said, ancestor worship and ancestral temple repair are what the younger generation should do. And doing merit are two different things.
Ancestor memorial tablet is generally called "an ancestral memorial tablet" or "an ancestral memorial tablet reconstruction" or "an ancestral memorial tablet restoration", and then the donor's name is engraved at the end.
If it helps you, please adopt it.