How many power outlets should a kitchen have at minimum?

Takes up unnecessary space on the countertop and are also dirt catchers.

Neither nor. Anyone who plans sensibly - and that includes a deeper countertop than 60cm - will love these things.

Not to mention the rather expensive solutions.

I think that from €40 for the double socket + drilling, the price is perhaps even cheaper than many electricians.

the back panel and countertop are not drilled, the top one is the light switch