A 50-pt dehum (american standards for rating -- revised in last 5-7 years, older model would be "70pt") can handle up to a 4x8 to 5x10 area. That's runing constantly and barely keeping up.
you are better off going larger than you need. a 4x4 canopy and a 50-pt size dehum would work well.. It may cost more upfront, but longevity and potentially more efficient makes it worthwhile in the long-run.
1 size down would probably be okay too.
i know this is american store, but gives a point of reference -- https://www.homedepot.com/p/Frigidaire-50-pt-1200-sq-ft-High-Humidity-Dehumidifier-with-Bucket-in-White-FFAD5034W1/325191675
-- seen that as low as 180-229 USD, the 279 price is absurd unless inflation has really hit it hard.
but can compare specs... useful to correctly size what you buy. A step down in size would probably work fine. Though a cellar/basement has more ambient RH not produced by plants than anywhere else in the house, so you have to mitigate that factor too.
The 4x8 to 5x10 canopy i refer to is in the winter with ambient 30-35% RH.