Intact bucks together - short answer, no, not such a good idea. You might find some accounts that it worked, but that is extremly rare and imho not stable since hormones change a lot during the year, and when it escalates it escalates quickly. In nature bucks would drive rivals away - that is impossible in captivity, and the other buck not able to leave can be enough for a serious fight.
It might have a slim chance to work in a rather big, well structured space, and I think a bigger group would be easier than a pair or trio, but that imho is an expert level experiment. It also depends a lot on the individual characters, so nobody can give a blanket statement, only way to know for sure is to try it (and learn from the desaster
)
Does, on the other hand, if it is done right, establish a hierachy and pecking order, unless two characters are incompatible they can normally sort out an arrangement for living in a large enough space.
Not all pet sites are bad, lots of information there too, especially if you want them free roaming in the house. But yes, always be aware of the different viewpoint. I got kicked out from some boards for just mentioning that I'm breeding, but there are sites like Rabbitsonline.net that are perfectly reasonable. Of course I would never discuss recipes, dispatching or any meat related stuff there.
Intact rabbits as free roam house bunnys can be a challenge, and when they are driven by hormones this can be an unpleasent experience. I had my very first doe Fury in my apartment for 8 months, quarentine, sole Myxo survivor of 15 rabbits. She didn't leave any corner unmarked, turned all plinth into splinters and flakes - wood and PVC alike, started a tunnel straight into the wall, when I got a second "doe" in spring she got pregnant right away and had her first litter in my kitchen. Ok, granted, back then I knew very little about rabbits.
Now my herd buck and his spayed cuddlebun are my free range house bunnys, a intact buck alone was easier, but I don't keep any of my rabbits single anymore.