Each room is different in the way the acoustics sound, so trying them in your kitchen/living room won't give you the same results as you might get in the final location. It might give you a little idea if the 22's would meet your needs in a larger space.
Normally, you want the tweeters of the left/right/center to be as close to ear level as possible when seated. With speakers not attached to the walls, you will have more options on positioning them to get the best soundstage, vocals, bass response, etc... If you go fixed, I would try to experiment by using chairs/boxes or whatever at different heights and distances from side walls to make sure music and movies sound the best before you make it permanent. The voices in musice if set up right, will appear to be coming from your center speaker.
Here are a few pics of my theater through the years.
