At this point they are just babies, so it’s hard to know how they will be when they get older!
Fabric in general is iffy for buns. Some pee on it, some eat it (which is very dangerous), and others are fine with it.
It can be very cute to see bunnies all snuggled up with blankets and beds, but sometimes it’s just not possible. My girl Bertha was a fabric pee-er and chewer, so I used grass mats in her condo instead. Even cardboard and newspaper can work, although it isn’t the most aesthetic, the bunnies seem to like it. 🙂
As for the couch, they are also probably inclined to pee on it because it smell strongly of humans (in addition to the unspayed baby factor!). If you are determined to have bunnies on the couch (understandable!), you might look into couch protectors for dogs, or even those picnic blankets that have a waterproof layer on one side. That might be enough of a barrier to block the human smells that trigger marking, and will protect the couch for they they do mark.
If you search the forum for “bunnies peeing on bed” you will find lots of other creative solutions that people have come up with. 🙂
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.