True, thats the best approach in current situation
Sony HT-x8500 - I did audition it, but wasn't really impressive for some reason felt like Atmos on that soundbar was just kind of marketing gimmick.
However Sony HT-Z9F + optional surround speakers is some what closer to Atmos experience you could get. However its priced at 70+ for that price you can opt for JBL bar 9.1 which will be true wireless surround with Atmos
Other Atmos soundbar is LG SL8YG - which i think will seamlessly integrate with your OLED C9, It was decent with Dolby atmos demo which i heard at Reliance digital (certainly not ideal environment to experience audio considering lot of noise around you) i think it should sound better in bit of control environment like living rooms.
Couldn't audition Samsung q60r - They didn't had in demo at Samsung store nor at Reliance... Philips - Its been some years now, i have seen their products on sale in retail shop, so thats out of question
In my case i didn't had any source where i could stream Atmos content, so just ignore all these soundbar claiming Atmos capabilities.
If i recollect is correctly Profx do service Polk & Yamaha as well... however beware of online purchase of these products like from Amazon/flipkart etc... Product sold on those most of the time don't have Manufacturer warranty, it's always covered under seller warranty.
Hence if you can spend few hundreds more better to pick it from authorised dealers.
Cheers,