I am along time Maggie owner , having Tympani 1Ds and 20.1s. The general rule of thumb for maggies is to use what is called the rule of thirds to start with...that is...place your 3.6s 1/3 the distance from the back wall of the room (example ..if the rm is 18 feet deep..then place the 6 feet from the back wall)..this same rule is applied to the side walls..so if the room were 12 feet wide, place each speaker,s center 4 feet from each side wall.
This give you a starting point and from there you will need to listen then move them to find the best sound and imaging.
Your 10 foot ceiling is a big plus because it gives the 3.6s breathing room and avaids standing waves more common in 8 ft ceilings. But be prepared to move things around ...it's worth the effort. Good Luck