Just try to stay as close as you can to the correct driving position, like you were in a real-life racing car. Living room couches, different stands, seats and escritoires will not do the job like a genuine car game driving simulator cockpit will.
The real driving environment is nowhere close to the abovementioned home lounges, chaise-lounges, secretaries and counters, isn't it? So, at least you should try to have the correct driving posture. If you do not, you will not be able to experience the actual power and pleasure the present-day car driving home video games are bestowing. It's as simple as that.