Question Home cinema room setup advice

Posted this elsewhere and got no response so hoping this subforum gets more attention.

I'm planning to setup the room below for home cinema use - with a side use of home study, so I'll have a PC in there too. It's long, narrow and has a fairly low ceiling - 7x2.2m floorplan. Aiming for a 5.1 setup, and maybe Atmos at some point (if the low ceiling isn't an impediment.)



The TV is a Sony 65XE9305, Denon 2400H AVR and the only audio setup so far is a pair of Bronze 1's.

I've got two choices - down the length of the room and block the double doors, or wall mount on opposing walls. Pro's and cons:

Wall mount Pro's:
Immersive
Tidy
About the right viewing distance
Cons:
Issues with surround angles?
Centre will need to be wall mounted
Very close from edge of sofa to centre and TV

Length-wise on AV stand/cabinet Pro's:
More flexibility with layout/distances.
More options for surrounds?
Cons:
Less tidy.
Lose access to the double doors.
Bias lighting trickier (but not insurmountable)

If it were your setup, which way would you do it?
And what would you be thinking for surrounds and sub? I'm currently thinking that it doesn't need to be over-done, and I could look at either Bronze 1's or 2's for the lengthwise set up.
For a wall mount setup, would wall mounting Bronze FX's behind and slightly to one side of the sofa work?
Sub-wise, I'm sold on BK. Gemini, XLS200 or 400?

Anything else I should consider?