To me, that sounds perfect.
I use two on the top row, but it will run a little hotter, so one row on top is what I'm doing next.
To add, my performer vents on the bottom are open, and the top I adjust as I watch the temp on the standard thermometer.
And add a pan, pie tin, of water on the charcoal grate.
Everyone had different techniques, but what you're planning works great for my cooks.
Have fun!