Help me setup my system....

Hello
Here are some pictures of my home theater
The TV is on its legs, but will be attached to the wall, and my CSiA4 will go on top the cabinet. The 2 main speakers are RTiA5
For now, I do not have any surround. As you can see, the couch is against the back wall
1) What surround speakers would you recommend? I would like to have them somehow "discreet" (small). But I can't have them in-wall though
2) What height should they be placed, and how far on the sides? I believe they should be facing the hearing position?
3) I would like to enjoy Atmos, but don't want to install in ceiling speakers. I thought about front height, such as the Polk Monitor M3 II, firing toward the couch
Or should I place them just above the couch, in the corner wall/ceiling?
Are the M3 II good enough for that purpose (regardless of the placement) or should I look for something better (but again, don't want to go too big)

FYI, I will probably go with the Denon X3400H..........

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RTiA5 + CSiA4 + Jamo SW410E
Yamaha TSR-700 (equivalent to RX V6A)
No surround...yet
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