Double carport closed on 3 sides. Point - strip foundation?

Hello

we want to build a double carport (6x6 m) that is closed on 3 sides (except for an upper ventilation area). A friend of mine, who works as a carpenter and is helping me, said that we should make simple point foundations (4 posts per side, so 10 in total, without middle posts) instead of a complex "U"-strip foundation made of cellar wall stones.

I have often seen carports with point foundations, yes, but is that sufficient if the carport is closed on 3 sides? I am now thinking less about the wind from East/South/West hitting the closed sides and more about the open North side where the wind almost pushes under the carport roof. Ok, from the North direction here in northern Schleswig-Holstein, the strong winds or especially storms are not common, rather from East or West.

We have wind load zone 3 here

What do you think?

oh yes, the floor consists of tough recycled material that has been lying there for several years, on 3 sides (that is, on the sides where it will later be clad) there are 30cm deep curbs (+ approx. 20 cm thick concrete) where the carport is practically built into

As a rule, 30*30*80cm pad footings are sufficient...

If it is to be clad on all 3 sides, I assume it is made of wood? Wood should not be extended all the way to the ground. Of course, with basement wall stones, you have the advantage that the lower area consists of concrete, so the wooden cladding, for example, ends 20 cm above ground level (I always think of snow that may be blown or shoveled up to the carport side).