Well to be fair I put Greebo straight into a sectioned off bit of the study, which is pretty much the bunny room. That bit I sectioned off for him is usually where Terry and Maggie have their food, water, and litter trays. So I put him straight in enemy territory. But I did it knowing how placid Terry and Maggie are. It’s probably not something that should usually be done though, it would upset some rabbits quite a bit. I made sure the area was clean so it didn’t smell tooooooo strongly off Terry and Maggie. But I also knew if things went bad I had back up rooms for him to go in. More inconvenient rooms which is why I didn’t start with them, but I had them in mind just in case.
There are lots of option for you. I’m not an expert in bonding – I have been super lucky with all my bonds so far being instant thanks to Terry. I have never bonded a trio before. I would suggest using the search function of this forum to do some research, I found it really useful.
You do need to consider a few important things though:
Do you have the space for a third bunny if you can’t bond them as a trio?
Are you prepared for the possibility that your current pair may split up, leaving you with three lone rabbits or a different bonded pair?
Are you prepared to spend potentially months bonding a trio?
As for gender, I have seen lots of each, and I think either gender is possible. I think a second female is more commonly suggested, but I think there are a few members here with 3 males, or 2 males and 1 female. Or I think even larger bonded groups of either gender. If all goes well for me, I will have 2 males and 1 female. I went more for “which local rescue rabbit is small, desexed, and needs a home?” I think you mostly want to make sure if you get a third rabbit that it is similar in size to your current ones. A bit of size difference is okay, but things can get awkward if one is too much bigger.
I think it is pretty common to keep the new bun in the same room as the other buns, but keep them separate for a while, similar to bonding a pair. Then move their cages (or whatever you have as living quarters) closer to each other – research pre-bonding if you are unsure. But when you want them to meet for the first time, neutral territory is best – same with bonding a pair. Some people find it easier to do meets separately – introduce new bun to one of the bonded buns at a time. Other people find it easier to put all three together.
I haven’t decided what I will do yet. Will see how they go and decide later.