Retail solution is not the keyword here. What I am searching for is an authorized/lawful (safe) solution.
Sorry to comment negative, but your wording doesn't make sense. either you will go for a DIY solution, cheap and illegal (but not necessary a bad solution), or you will purchase a retail solution.
Retail solution must have the required certificates to allow you to sell. Those are not cheap to get, which also provide the reason for a retail solution to
be usually fairly expensive
And also you need Notified Body
And I know that Cetekom can create certificate for Country Approvals