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I placed my sensors on the collectors on each side. I also have bungs welded into 1, 4, 5, and 8 in case I needed to move them but for the first try I went on the collectors to get a reading from the whole bank vs. just off of a single cyl on each side.
The response times at idle were a minor issue during the datalog with the sensors in the collectors. I did not notice any stumbling, rich smelling exhaust, etc. but the the tuner said in the datalog he could see an issue. He had to make some adjustments for when the engine is at idle to slow the responses and keep it from spiking back and forth. The last log came out clean.
Another thing to consider, outside of just the HEGO placement is the length of your intake track. If the MAF is too close you can get pulsation in the sensors readings, but if the MAF is too far away you get too sluggish of a response. There's a balance to strike so your FTs and response don't get screwed up.
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