[@Glyph] Do whatever works for you, but I'd advise against designated partners personally.  If you were only going to rp with two or three other people, then why did you join a group rp?

I'm not sure what you mean by spatial awareness.

If there's questions about who's where, the OOC or discord are easy places to make quick questions.  I find that asking for quick reactions or about hypotheticals helps me write good posts, and I usually reread things as I'm writing to make sure I don't miss stuff.  I also often make a quickreference sheet in my notes just so I keep people straight, and add to it as things go on and dynamics develop.  But that's just what works for me!