Although I have had rabbits over the years, we are new to housing multiple buns.
I cannot get over how vastly different their personalities can be, and how strong their personal preferences.
We were getting one...we have 14 not counting babies LOL
The only ones I have together are a pair of sisters and a pair of brothers and only as long as all is calm (they are just 12 weeks).
I have a mother and daughter who want nothing to do with each other.
I have two unrelated young bucks who enjoy being side by side.
I have a 2 lb buck and a 14 lb buck who loathe each other.
I have a doe who pouts unless she has another doe beside her.
And my FG buck adores my FG cross doe-- they used to be caged side by side and now he runs loose but his chill space is always beneath her pen.
I accommodate where I can, to make for happy bunnies but having seen how complex their relations are, I never put two together in the same space outside in the grazing pens or otherwise because it can go south so quickly.
We love having all their differences but I think successful bonded pairs take a lot of luck, space and neutering!