9" 'sounds' like a good one---any highter and most of us won't see all the minutia anyway(and a LOT of homes just dont have high ceilings and you want your exhibit to look like 'their' setup). there are brick anchors sold at the hardware stores --- you dont need the really BIG ones and dont get the babies either! (check for the weight reccomendations-if any--and got highr than they say-I think they lie on the shy side!)these things need you to predrill a hole into brick(do NOT drill into the morter), then blow out the crud in the hole, then hammer the insert into the hole, then screw in the screw into the insert(which expandes the insert for a nice tight fit(if you did the hole correctly). 2 things---I would insert these into the bricks in a downward angle(away from you), and I would wrap the exposed screw-threads with some tape(to help prevent threads from digging into whatever you use for hanging--I overkill here somewhat), and I would NOT use non-metal at this point(if your hanging system doesn't have metal mounting-use someone else!). lol