I used rollers quite a bit last winter and never got comfortable enough to keep my water bottle on the bike. I have a step on either side of the rollers for take off and landings. Some people build wooden platforms so they can mount the bike in a more normal fashion, there are a few example setups on youtube.

They did make riding inside more tolerable though. Even without a resistance unit you can still get a pretty good workout. But having a speedometer attached would be completely pointless since without wind resistance to slow me down my minimum speed was around 45 km/h. I removed the wheel magnet after the first ride, and only used my heart rate and cadence sensors. I had my rollers setup in front of a tv, which I would leave off so I could see the reflection of my position on the rollers so I didn't need to look down. And a powerful fan, because you'll sweat a lot. With rollers you really need to have (or develop) a smooth pedaling technique. If there is any surging the bike will start to rock forward and backward. The surging thing pretty much means its not possible for many people to safely pedal on rollers while standing.

I'm thinking about getting the inside ride e-motion rollers which have a shock system for dealing with surging, so you can stand and pedal on them. Downside is they cost as much as my road bike did, and the rail system means you are even further off the ground.