for best accuracy (but reduced peak luminance) you probably want to profile the TV in SDR mode (HDR mode will negatively affect measurements due to internal TV processing) and use a HDR to SDR 3D LUT. Make sure to enable white level drift compensation and use a small patch size.
Should I be worried about burn-in from pattern generation?
Probably not. The patterns are small and only on screen for a relatively short amount of time.