That site lists many of candidates as "support" just because they have not publicly opposed, so it is not a realistic view on the opinions of EU parliament. Better to look at actual votes cast.

Also, they are not distinguishing between supporting mandatory monitoring and other forms (e.g. present legal situation where monitoring is allowed).

The current proposals do not include mandatory monitoring. If mandatory chatcontrol had the wide support that site suggests, it would have been introduced and passed long ago.