The Terror twins are named after Agatha Christie's classic sleuths Tommy and Tuppence.
Despite having no known meta-human abilities, Edward Nigma (Riddler) wears a power-suppression collar while incarcerated at Belle Reve Prison.
Included as a From the DC Comics Vault special feature on the bluray release of Suicide Squad: Hell to Pay (2018).
The events depicted occur on September 14th, 16th, and presumably the 17th.