What is the protocol for adding music video titles to the last completed movie pages?

I know I've read that for example if you just add a few vehicles to a tv series you shouldn't add the title to last completed, so that the other movies on the list would have a better chance of being seen and having their unidentified vehicles identified. I have omitted adding a batch of recently completed music videos because I thought that since some of them have rather long titles, it would take up the whole list. Just wondering how the etiquette for this works.