The short answers are: maybe for the 3.6s and no for the 20.1. Perhaps not what you want to hear but here are the reasons.
The problem is with the short axis (12 1/2") of your room. You do not have enough room laterally to place your speakers along that short wall. So you must place them along the long wall as Slipknot1 does in a 17 x 23 room. With the speakers 2 feet from the front wall (a minimum really) and your listening spot 2 feet from the back wall (a must for good sound), you are now only 8 1/2 feet away from large panel speakers, which should be about 6 to 8 feet apart. 8 1/2 feet may or may not be enough distance for the sounds from large panels to blend properly--slipknot1 has 5 more feet than you do, which is critical for the sound to blend.
It's a very close call in your room for the 3.6s but the 20.1s are probably too big. The limiting factor is your short wall. (The same size room with 14 1/2 x 18 dimensions would have been ideal for these speakers). With lots of tube traps, you may be able to place the speakers closer to the walls and give them enough distance from you to make a great sound. Try before you buy.
The problem is with the short axis (12 1/2") of your room. You do not have enough room laterally to place your speakers along that short wall. So you must place them along the long wall as Slipknot1 does in a 17 x 23 room. With the speakers 2 feet from the front wall (a minimum really) and your listening spot 2 feet from the back wall (a must for good sound), you are now only 8 1/2 feet away from large panel speakers, which should be about 6 to 8 feet apart. 8 1/2 feet may or may not be enough distance for the sounds from large panels to blend properly--slipknot1 has 5 more feet than you do, which is critical for the sound to blend.
It's a very close call in your room for the 3.6s but the 20.1s are probably too big. The limiting factor is your short wall. (The same size room with 14 1/2 x 18 dimensions would have been ideal for these speakers). With lots of tube traps, you may be able to place the speakers closer to the walls and give them enough distance from you to make a great sound. Try before you buy.