Set-up: Sensor Bar...how high? Gameplay...how far away?

[TivoTron]

Just got the Wii set-up. Brilliant machine.

Question:
I have a 40" LCD with about 6'-7' of room in front to play. The TV is at eye level, or maybe a bit higher.

(1) Should I go high or low with the sensor bar? (I will obviously try both, just curious if people have had varying results...especially with gameplay so close to the TV)

(2) How close/far from the TV have you been able to successfully play Wii?

Thanks...and have a good weekend...