I heard hard surfaces can be really hard on their hocks causing sore hocks because it doesn't let there feet move the way it should like they would in the wild.
I would say your rabbit is only at risk of getting sore feet if he's sitting in urine, which can eat away at the fur and skin. Also probably at a higher risk if your rabbit is obese and/or sits around a lot. Keep your bun healthy and clean, offer it space to run around, and offer a variety of surfaces. You'll be fine. You'll also notice that your bunny gets hay everywhere...so part of the time they're walking around on hay anyway.
Here, I'll show you my setup now. (Don't worry, I hadn't forgotten about you!) I started with just one "room" because the smaller space makes it easier to litter train them. At first, he peed in his bed and on the floor of his cage a few times. You just put some of the urine (if you can absorb it and then dab it in the litter box) where you want him to go and thoroughly clean where you don't want him to go. I also threw as many of his poops as I could in the box. In fact, I've noticed that since I clean up all his poops every day (often throwing them in the box, especially when he's out and about), he's stopped laying them everywhere. Occasionally he does it when he's out, but he doesn't do it in his cage anymore, and any hay he pulls out, he eats. I hardly have to sweep up after him anymore.
Okay, so the first thing you'll notice here is that I have his hay and water over his litter box! So most of it falls into his box (and the water bottle can drip into it). Not only that, but rabbits like to poop when they graze, so it naturally makes him want to defecate there. If you're wondering what I used for his hay, it's an egg basket. I popped a piece of tag board in the bottom to keep the hay in better. I'm not a fan of typical hay racks which hang on the side of the cage and just get hay all over the floor, or open racks where the rabbit can just pull all the hay out right away. I prefer to hang them as close to the middle of the cage as I can to keep the hay contained. I actually have it on a tight spring (I want to say it goes to a water bottle I once had) so it can swing and bounce! Lastly, because I actually have two separate rooms for him, all the hay stays in the smaller kitchen/bathroom area.
Here's his hallway. I wanted to put bricks in his cage for something to wear his nails down and rub against. Turns out they worked well for creating a hallway he can't escape from.
His bedroom. His bed is a stacking bin (with a slick rug in it) and his levels are just wire kitchen racks. Thinking of putting some sort of flooring on them, but since they're optional for him to sit on, I'm not too worried about it for now.
And the whole thing, so you know what the heck you're looking at.
Hopefully you can get some good ideas. I really don't even have to do very much upkeep anymore, just change out his litter every few days.