Summary:
CPC200-CCPA - It works with Wired + Wireless CP & AA. Works for X50 using Autokit URL1 only.
CPC200-CCPW - It works with Wired + Wireless CP. AA only wired supported.
CPC200-CMAP - It works with Wired CP & AA only. Works with X50 using Autokit 2019.

Haha don't waste money. Stick to the ones I said above.

Carlinkit 4.0 CP2A - For cars natively support only wired CP. Allow Wired / Wireless CP & AA without installation of Autokit.apk.
Carlinkit 3.0 U2W plus - For cars natively support only wired CP. Allow Wired / Wireless CP without installation of Autokit.apk.
Carlinkit A2A - For cars natively support only wired AA. Allow Wired / Wireless AA without installation of Autokit.apk.

We don't need this. CCPA / CCPW / CMAP sufficent for us using Autokit.apk.

What cars require above? Maybe like HRV or Honda City. They can't install Autokit.apk but they want to upgrade from wired CP / AA to wireless CP / AA.

Technically it should not, but some apps will run in the background even though you didn't open.
Additionally, if you IHU running out of space also will cause issues.

For optimization, you can also consider the optimization script from Xeon1989 GitHub.
https://github.com/xeon1989/Proton-X50-APK-...Optimization.md

Any checklist I can use upon taking delivery of new x50?

Thanks.
Took delivery already.
Later I will check.