In brief- yes, we can submit 8 (probably widely disparate!) entries as a named group submission. Although this is not clearly stipulated on the form, Tracey sees no problem, providing the work is entered under a group name and relates to a unifying theme.
So, we are clear on both counts.
And, while I'm here, Ampersand Duck might like to know that "Pron Coktails" is currently on display with other books in the collection.