Most rabbits, if housed indoors where the people are, can do just fine as single bunnies. Outdoor rabbits need to have a companion because they spend so much time without interaction.
If you are planning to house indoors, then I'd suggest finding an already-fixed rabbit -- one rabbit should be just fine. Rabbit rescues (different than generic shelters) will have all different sizes/types of rabbits. You'll be happier if you choose a rabbit based not just on breed-type but on personality. That's the most important.
[Those who think it's best to get a baby are mistaken because in a few months they are suddenly surprised when bunny forgets his litter training, turns aggressive and starts misbehaving. Then they discover that the solution is to spay/neuter and they are not at all happy to have to pay the expensive vet costs for the surgery. And starting with a baby, in no way makes them like to be handled more.]
The personality of the
fixed rabbits that you see at the rescue is just what you'll get (while baby ones will completely change).
Some other pros for getting rescued rabbits:
Rescued rabbits are vet-checked, so no health issue surprises.
The rescuers know their rabbits and can tell you the distinctiveness of each one.
They have unique mixed-breed rabbits that can be adorable.
You can hold and see and "get to know" the choices at a rabbit rescue and they don't mind you taking your time to find the right one. (All rabbits have distinctly different personalities.) This way you can choose one that likes you too.
So, all that to say that having just one rabbit is an option. I should note that there are those rare rabbits that, even when housed indoors, really seem to need a bondmate.
Here are a couple possible sources for available rabbits:
https://www.facebook.com/RabbitWranglers/app/190322544333196/
https://www.thinkingoutsidethecage.org/meet-animals/adopt/rabbits/
