Like this. I could have done 4 plants, but I needed room for the drain to waste bucket and pump.
Also my diy auto watering systems pump works great with 3 hydro halos, but isn't strong enough for 4.
Eventually I'll make changes and build a drain system that pumps the waste out of the tent without needing that bucket, and will make it so the plants are closer to the floor, so I have more room for growth.