Annotation
not Note.
OK.
The assumption is this: I have the original CD in my hand.
If I create a new release, I will add Matrix to Annotation.
This is obvious.
But if I add my data (if necessary) to an existing edition (author - another user), where should I add Matrix?
To Annotation or Note?
Personally I add this information to the annotation field, since it is most visible there. But if you include it in the edit note during attachment of your DiscID that’s fine as well.
Up to you 
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What if the Matrix is already included in an existing release Annotation?
So how do I put my Matrix in the same Annotation? 
Ooooh! No, that is naughty. If your matrix code is significantly different from existing information provided in the annotation, then you are dealing with a different release and you need to create a new entry. After all, that is why we are collecting this information: to distinguish the various releases of the same album.
Sometimes, it may be tricky deciding when a matrix code is significantly different but if you ever happen to run into such a case, you can read previous discussions here and there at this forum to help you decide.
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We are now talking about the album U2 - the best from 18 DiscID.
One of them is mine.
So I guess I have to give you a couple:
DiscID and Matrix
I am sorry, but I am not following. Did you mean to link to an example?
The album you mentioned in the OP does not have the matrix code in the annotation field, only a DiscID.
Yes. It’s about the title in the OP.
Does each different DiscID have a different Matrix?
Because if I add my Matrix, won’t it conflict with other DiscIDs?
Yes, necessarily.
Standard case - a release should have not more than 1 discID attached. Other discIDs usually don’t belong to this release.
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You can remove disIDs, that have no mention in the history and all that are already attached to other releases. But you can also leave them and note which is the correct discID for this particular release.
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I’d rather not read history and decide based on it.
You have more experience.
What would you say for that:
For my part, I can enter 1000 real CDs using Lookup Picard.
Is it enough if I include a template like this in my editorial note:
"I have a physical CD.
DiscID is: ######
Matrix is: $$$$$$$
"
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This template would be for an annotation. In an edit note, only the matrix has to be noted. The Disc ID is part of the edit anyway. (Add disc ID or Set track lengths (from disc ID)
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OK.
That’s what I did.
I just need to buy a bigger magnifying glass.
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An example puzzle that has already popped up: https://musicbrainz.org/edit/111603185
An Austrian DADC pressing with two different discIDs. A reason to add extra details to at least the Edit Note of the DiscID and\or Set Track Length. Or better to the main Annotation for other people to see and check.
We are not doubting what you are adding, but others will come along in the years after us and we help them with clarity. There are many discIDs added by people without checks.
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Add disc ID and Set track lengths will do. An annotation to the release would be a bonus.
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I do these things:
Add disc ID and Set track lengths
but under which activity should I add the Matrix details?
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What do you mean by “activity” - writing the code is sufficient.
In an annotation something like your template would be sufficient too, but it would be better if it was presented nicer to look at.
example
here
https://musicbrainz.org/edit/111602646
or here
https://musicbrainz.org/edit/111602677
?