I agree with the above, the midwest cage isn’t big enough. Firstly it’s too short, and secondly you would also need to attach a playpen onto it for extra space to run around in during the day when you’re home.
Fleece can be used, I use fleece for my pair, however unlike guinea pigs which don’t really ever chew fleece, most rabbits do. My pair occasionally chew their fleece, a little hole here and there. But they tend not to ingest it, if your rabbit chews fleece a lot and eats it you will need to take it away. But as a general rule, rabbits don’t need bedding, just soft place or two to lie down if they want.
And yes, two rabbits can be housed together. From what I’ve seen of guinea pig bonding, rabbit bonding is harder and more uncertain. Just because you have a neutered male and spayed female, does not mean that they will get along and you may end up having to house them separately permanently. Bonding can take a long time (months) and you will need to house them separately for the entire time you are bonding them. Which is why many people opt for adopting an already bonded pair from a rescue.