You should be good. I have a flat lid and mine is at 9". My plan is to put another grate near the top when I get a dome/ weber lid for it. I would suggest maybe using some sort of heat diffuser on top of the charcoal basket. I found a perforated pizzia pan that fits perfect on the basket for a diffuser.
UDS, Mini-UDS, smokey joe, gasser, 3 pie irons, and a weenie fork.