March WV are likely all booked- they don’t have a heap, people are planning next year to be more open/free for travel and they became bookable 12 days ago, plenty of time for them to book out.
there is definitely a minimum stay requirement; whether it is intentional or accidental carry over and no one has bothered to fix it, if you didn’t search for 7 nights you’ll have found nothing.
based on all this, I’ll be searching for April from May 1 with a minimum 7 nights, then muck around with options once I find it.
This minimum stay is even more likely in April due to Easter- I have in writing from Moli that they had a ?5?6 (need to check) night minimum in 2019 over Easter