I think remote research collaboration has a valley-of-inefficiency, where at mid-low levels of collaboration-competence it is much better to just do all research on your own rather than trying to split things up between multiple people (probably due to coordination/communication overhead and all the usual stuff).

While there's been a lot of posts here regarding advice for independent researchers, I haven't seen much for research collaborations (especially at small-scale, without a legible central leadership). People seem to do it pretty frequently/reliably though, e.g., all the forum posts with multiple authors.

Are there any advice/resources/procedures for effective remote research collaborations on the scale of 2-5 people?