Hijacking threads (within reason) can happen around here
Obviously, the archive supports both ways, in that you can publish them individually, or lump them together into a single one. IMO, if the oneshot stories are tightly related/coupled, then a single story as a collection would make sense. If they’re not related, then separate stories would be less confusing. One pro of separate postings is that you’d get separate hits/reviews for each one. A pro to multi-chapter is you’ve got better control to the sequence the reader will most-likely browse through them, if that helps with cohesion between the oneshots.
Anyways, welcome to the archive & forums!