Hi guys. Need some urgent advice. Room size is length from acoustically transparent screen to rear wall 4.2m x 4m. I want to install 3 x M&k S150 LCR at the front; 4 x M&K 750 as left and right surrounds (a pair on each side); M&K K4 Tripoles as rear surrounds and lastly 4 x M&K550 surrounds as atmos speakers. I have 2 rows of seating. Back row on a riser about 0.5m from back wall. Second row about 1.5 - 2m from back wall. I need help with recommendations on actual placement & height of surrounds and placement of the 4 atmos speakers e.g in centi/meters? Or any suggestions. Thanks.