Hi and welcome to the forum!!!
Yes, using the Tommy Ring TM will indeed add more smoke and will raise the basket off the bottom.
You will find the meat closer to the top will cook faster than the lower meat will, and this will help when cooking two different foods at once.
The side smoker box that comes with the SRG works just not as good as it should. I use a 10 in ring in my SRG's so a 10.5 will fit the bill well. Just keep an eye on the ring cause over time it will deteriorate if it's not a strong metal