Currently running a 7.1 in a small area. seating position is against the back wall. so rears are in same back wall with adjustable cones kinda pointing towards seating position. because of shape of room (small) it was not possible to put side surrounds on floor at ear height. these are mounted on (not in) ceiling and firing down towards optimal seating area. and then the three front and sub. I am thinking of upgrading to 5.1.2 Atmos. the typical setup has the first 2 height speakers in the ceiling at the front firing down for a 5.1.2 setup. This seems odd in that my seating is not optimal to hear the enveloping sounds focused in front of the room from speakers firing down. I was thinking of converting my side surrounds to be the .2 height speakers and leave the rears as back surrounds. These sides are near my seated position where if I was doing a 5.1.4 setup I would put the 2 rear height speakers. Any optimal setup rules say they first two need to be in the front or put the speakers where I like?