That looks awesome, I think the 55cx @ its current special offer price no question its awesome and the better buy especially if you can manage the space factor.
Did you extend your desk with another piece of board and use clamps to hold it in place ?
Bit tricky to see in the dark room, but I was thinking of doing similar but reverse pull desk backwards and add a bit of board behind it and wall mount the monitor onto wall to get around it, creating that distance between you and this beast (even 48") really brings it out.
OLED works best in a dark or low light rooms, not in bright lit rooms.
I used a 'Sanus VTVS1 stand' because it's all made of metal and not glass base like some, so I could put my 4KUHD player under the TV like in the image I also used a 'Soges adjustable lap table' but the table top was not long enough so had to use a 56x40cm half inch plywood board and screw it on the metal stand so I can move it, to put my keyboard and mouse plus microphone on and I didn't want to sit too close to an OLED in HDR when playing games, it would burn my eyes out
At first I was going to buy the CX48 but after seen the CX55 and the price differences so I got the 55 but if you have a small room then best to get a 48.
You will find all on Amazon hope it help you
The TV stand
Sanus VTVS1 Universal Swivel TV Stand for 32-60-Inch Screens - Black
The table
soges Adjustable Lap Table with Slot Mobile Laptop Computer Stand Bedside Table Portable Side Table for Bed Sofa,
HDMI cables
3M HDMI 2.1 Cable 48Gbps by True HQ | 8K Ultra High Speed PREMIUM Lead with Ethernet | 8K 60Hz 4K 120Hz UHD HDCP 2.2 eARC | Dolby Vision Dynamic HDR PS5 Xbox Series X | Zinc Alloy & Gold
Extend cables
AmazonBasics USB 3.0 A-Male to A-Female Extension Cable (3 m )