Before landing in Normandy, there is almost no fixed position, because General Pickert, commander of the IIIFlak Korps wanted batteries to always be mobile, that's the reason why there are almost no anti-aircraft bunkers in Normandy thinks I'm talking about the inland not the coast.
I have a good source on the III Flak Korps. I will be able to give you more information later.
This is the Flak-Regiment 32 (which will become the Flak-Sturm Regiment 1 in June), a unit of the III. Flak Korps of the Luftwaffe, established in Calvados before the landing.
The 8.8 cm Flak guns of this regiment were mobile. General Pickert who commanded the III. Flak Korps insisted that these troops train to move to maintain their spirit of mobility. Thus the 8.8 cm Flak batteries of the FR 32 often changed position. As these units are mobile, this explains the lack of dedicated Luftwaffe-type bunkers.
On June 6, 1944, the four 8.8 cm Flak batteries were in place in the St Clément, Gefosse Fontenay, and Granpcamp Maisy “south” sector."