I use HFT-X on top and front of speakers and one in the middle of the front wall between speakers. HFT2.0 on both side of the speakers and 1 on the bottom wall under the HFT-X and 2 on the back wall 8' up on each sides. Regular HFT 5' and 8' up on each sides of front wall and about 12' up center of front wall and HFT 5' up on each sides back wall and 5' up center of back wall. 2 HFT 5' up side wall aligned to my listening position. Every room is unique so results will vary. I hope this helps.
BTW I also forgot to mention my entire front wall is covered in acoustic carpet used for theaters.
BTW I also forgot to mention my entire front wall is covered in acoustic carpet used for theaters.