Are there any special rules for daytrips to high risk areas?

I have a daytrip booked to Mallorca (FRA-PMI-FRA) in about a week and am leaning towards flying. The current rules demand a test done no more than 48h before arrival in Germany with a negative result in order to avoid being quarantined.

With a daytrip, it means I can make a test in Germany before departure to Mallorca, then go to Mallorca and back, then present this German test as a proof of not needing a quarantine. This is of course absurd (the test would be done before I even entered the high risk area), but the wording of German regulations seems to allow it. Am I correct here?

Is a test/quarantine needed at all in case of a daytrip? After all, the 48h requirement means the risk of the traveler getting infected within the last 48h of his trip and not getting caught on return is accepted. So what if the whole trip takes way less than 48h - is a test needed at all? I would be leaving the airport in PMI in order to go to the beach, and am not doing an open jaw, so I cannot pretend this is a "connecting flight" exempted from the quarantine requirement.

Any insights? Thanks!