Hi Karel,
So, your 2nd setup is the correct setup to make MI work with CAOS in Compatibility Mode.
You just need to make sure that Dual Tracking is enabled in both plugins.
When you enter your GAv3 tracking ID (starting with UA-) in CAOS, a checkbox will appear, called “Enable Dual Tracking”. Once checked, another option will appear, called Measurement ID. Which is where you should enter your GAv4 Measurement ID (Starting with G-)
Since you’re a CAOS Pro user, use this contact form, so I can send you CAOS Pro’s latest beta, which includes major improvements in terms of GA4 support.
Alright, I just discovered another issue. Stealth mode is working fine for UA but not for GA4. For GA4 my visits using Adblock are not counted… Will contact you via the form.