You'll love your your 65" LG OLED TV! I bought the LG CX OLED a few years back
I have a 5.1 but only use the front three channels plus a sub
It's all contained in a low profile credenza with the T V above If your only option is a sound bar you might want to consider one that comes with a small sub thats easy to hide. All things considered you might be pleasantly surprised by the sound quality from your new TV