Wait, Harley Quinn's voice from the animated Harley Quinn TV Show, was shown in a multiversal montage in Titans? (I have discovered it reading it in the dcmultiversewiki.com, that I didn't know existed) Then I think it is safe to put it in the Live Action Multiverse even if it is animated. I don't watch Titans so I tough that it was just a TV screen showing Harley Quinn and Pro Bot just wanted to add Harley Quinn because of some weird Comics Multiverse logic of Earths being presented as fiction being real or something, but if it is presented in an scene showing the multiverse, then yes, why not?